Articles

175 entries

0001 Virtual environments with venv A virtual environment is a private folder of Python packages for one project, so projects never fight over versions. Create one with… Beginner · Concept · Any system Article Environments & packages 15 Oct 2026
0002 Python cheat sheet: strings, lists, dicts and f-strings The everyday methods for text, lists and dictionaries, plus f-string formatting and comprehensions, each with a one-line example you can paste into… Beginner · Reference · Any system Article Basics 15 Oct 2026
0003 pathlib cheat sheet: files and folders in Python pathlib.Path is the modern way to build paths, read and write files, and list or search folders in Python. This page lists… Beginner · Reference · Any system Article Files & automation 15 Oct 2026
0004 Logging instead of print The logging module gives every message a level, a timestamp and a destination you can change without editing code. It is the… Intermediate · Concept · Any system Article Files & automation 15 Oct 2026
0005 Dataclasses in depth @dataclass writes __init__, __repr__ and __eq__ for classes that mainly hold data. Learn defaults, default_factory, frozen and ordered classes, __post_init__ validation, slots… Advanced · Concept · Any system Article Basics 15 Oct 2026
0006 Testing with pytest: first tests, fixtures and parametrize pytest runs plain functions whose names start with test_ and reports every failing assert in detail. This guide covers setup, assertions, exceptions,… Intermediate · How-to · Any system Article Testing 15 Oct 2026
0007 Fix: ModuleNotFoundError: No module named ‘…’ Python cannot find a module you import. Usually the package was installed into a different interpreter or virtual environment than the one… Beginner · Fix · Any system Article Common errors · Environments & packages 15 Oct 2026
0008 Fix: TypeError: ‘NoneType’ object is not subscriptable You used [ ] on a value that is None. Something you expected to return a list, dict or match returned nothing.… Beginner · Fix · Any system Article Common errors 15 Oct 2026
0016 let, const and var: variables and scope in JavaScript Use const by default, let when a value must change, and avoid var. The difference is about scope: where a variable is… Beginner · Concept · Any system Article Basics 15 Oct 2026
0017 JavaScript array methods cheat sheet: map, filter, reduce and friends A quick reference for the array methods you use every day, with what each one returns and whether it changes the original… Beginner · Reference · Any system Article Basics 15 Oct 2026
0018 Promises and async/await explained A promise is a placeholder for a value that arrives later. async/await lets you write code that waits for promises as if… Intermediate · Concept · Any system Article Async code 15 Oct 2026
0024 TypeScript basics: types, interfaces, unions and narrowing TypeScript adds type annotations to JavaScript and checks them before your code runs. These are the core ideas you need to read… Beginner · Concept · Any system Article Basics 15 Oct 2026
0025 Regular expressions cheat sheet (JavaScript flavor) The regex syntax you actually use, from character classes and quantifiers to groups, lookarounds and flags, with the JavaScript methods that apply… Beginner · Reference · Any system Article Basics · Basics 15 Oct 2026
0026 Fix: TypeError: Cannot read properties of undefined (reading ‘x’) You tried to read a property from a value that is undefined or null. Find which value is missing, then guard it… Beginner · Fix · Any system Article Basics · Common errors 15 Oct 2026
0027 Fix: SyntaxError: Cannot use import statement outside a module The file uses ES module import syntax, but Node or the browser is loading it as a classic script or CommonJS. Tell… Intermediate · Fix · Any system Article Common errors · Node.js 15 Oct 2026
0033 The everyday Git workflow: status, add, commit, push, pull Git moves your changes through three places: the working folder, the staging area, and the commit history. These five commands, plus .gitignore… Beginner · Concept · Any system Article Housekeeping · Setup 15 Oct 2026
0034 Merging vs rebasing in Git Merge and rebase both bring commits from one branch into another. Merge keeps history exactly as it happened; rebase replays your commits… Intermediate · Concept · Any system Article Branching & rebasing 15 Oct 2026
0035 Undoing changes in Git: restore, reset, revert, and reflog Pick the undo command by where the mistake lives: in a file, in the staging area, in a local commit, or in… Intermediate · Concept · Any system Article Undoing changes 15 Oct 2026
0036 Finding the commit that broke it: log, blame, and git bisect When something used to work and now does not, Git can point at the commit that changed it. Start with log and… Advanced · How-to · Any system Article Finding bugs · Reading history 15 Oct 2026
0037 Git cheat sheet The Git commands you reach for most, grouped by task and using the modern switch and restore forms. Copy, paste, and replace… Beginner · Reference · Any system Article Git 15 Oct 2026
0038 The pull request workflow on GitHub A pull request asks to merge your branch into another one, with review and automated checks in between. This is the whole… Beginner · How-to · Any system Article Pull requests 15 Oct 2026
0039 A minimal GitHub Actions workflow that runs your tests Add one YAML file under .github/workflows and GitHub runs your tests on every push and pull request. Here is a small, explained… Intermediate · How-to · Any system Article GitHub Actions 15 Oct 2026
0040 Fix: error: failed to push some refs to … Git refused your push, usually because the remote branch has commits you do not have yet. Bring them in, combine them with… Beginner · Fix · Any system Article Common errors 15 Oct 2026
0041 Fix: CONFLICT (content): Merge conflict in … Two branches changed the same lines and Git cannot choose for you. Open the file, keep the right text, remove the markers,… Intermediate · Fix · Any system Article Branching & rebasing · Common errors 15 Oct 2026
0042 Fix: fatal: refusing to merge unrelated histories Your local repository and the remote do not share a single commit, usually because both were started separately. Allow the one-time merge,… Intermediate · Fix · Any system Article Common errors 15 Oct 2026
0049 Pipes and redirection: connecting commands A pipe sends one command's output into another command, and redirection sends output to a file. Together they let small tools build… Beginner · Concept · Linux, macOS Article Basics · Text processing 15 Oct 2026
0050 File permissions: chmod, chown and what 755 means Every file has an owner, a group and read/write/execute permissions for three kinds of users. chmod changes the permissions and chown changes… Beginner · Concept · Linux, macOS Article Basics 15 Oct 2026
0051 Environment variables and PATH Environment variables are named settings that every program inherits from the shell. PATH is the one that tells the shell where to… Beginner · Concept · Linux, macOS Article Basics 15 Oct 2026
0052 Slice and summarize text with grep, sort, uniq, cut, awk and sed A handful of classic tools can filter, count, extract and rewrite text right in the terminal. This guide shows the patterns you… Intermediate · How-to · Linux, macOS Article Finding files & text · Text processing 15 Oct 2026
0053 Set up SSH keys: ssh-keygen, ssh-copy-id and ~/.ssh/config SSH keys let you log in to servers and push to Git hosts without typing a password. Create an ed25519 key, install… Beginner · How-to · Linux, macOS, Windows Article Keys & config 15 Oct 2026
0054 Fix: Permission denied (publickey) The server refused every key your SSH client offered. Find out which key was offered, make sure its public half is on… Intermediate · Fix · Linux, macOS, Windows Article Keys & config 15 Oct 2026
0055 Docker basics: images, containers and the commands you need An image is a read-only package of an app and its dependencies, and a container is a running instance of it. Learn… Beginner · Concept · Linux, macOS, Windows Article Docker basics 15 Oct 2026
0056 Docker Compose: run a small web app with a database Docker Compose describes several containers, their ports, volumes and environment in one compose.yaml file, then starts them all with docker compose up. Intermediate · How-to · Linux, macOS, Windows Article Docker basics · Docker Compose 15 Oct 2026
0057 Shell cheat sheet: everyday commands A quick reference for moving around, managing files, viewing and searching text, checking processes and disk space in bash and zsh, with… Beginner · Reference · Linux, macOS Article Basics · Command-line tools 15 Oct 2026
0067 Your first SQL queries: SELECT, WHERE, ORDER BY, LIMIT and GROUP BY Read data from a table, keep only the rows you want, sort them, take the first few, and summarize groups with COUNT,… Beginner · How-to · Any system Article Queries 15 Oct 2026
0068 SQL joins explained: INNER, LEFT and finding rows with no match A join combines rows from two tables using a matching condition. INNER JOIN keeps only matches, LEFT JOIN keeps every row from… Intermediate · Concept · Any system Article Joins 15 Oct 2026
0069 NULL in SQL: why = NULL never matches and how to handle missing values NULL means "unknown", so comparisons with it are neither true nor false. Use IS NULL, COALESCE and careful aggregates to avoid rows… Intermediate · Concept · Any system Article Queries 15 Oct 2026
0070 Indexes and EXPLAIN: making SQL queries fast An index is a sorted lookup structure that lets the database jump to matching rows instead of reading the whole table. EXPLAIN… Advanced · Concept · Any system Article Indexes & performance 15 Oct 2026
0071 Fix: column “x” must appear in the GROUP BY clause or be used in an aggregate function PostgreSQL rejects a grouped query that selects a column with more than one possible value per group. Add the column to GROUP… Intermediate · Fix · Any system Article Queries 15 Oct 2026
0072 CSV vs JSON: choosing a format and avoiding the classic pitfalls CSV is a simple table of text; JSON holds nested, typed data. Both break in predictable ways: quoting, delimiters, encodings, numbers and… Beginner · Concept · Any system Article CSV & JSON 15 Oct 2026
0073 Fix: json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) Python's json module found nothing it could parse at the very first character. The input is usually empty, HTML, or already consumed.… Beginner · Fix · Any system Article Common errors · CSV & JSON 15 Oct 2026
0074 pandas basics: read a CSV, filter rows and summarize with groupby Load a CSV into a pandas DataFrame, inspect it, filter rows with conditions, and compute totals per group, with the SQL equivalent… Intermediate · How-to · Any system Article Data analysis · Files & automation 15 Oct 2026
0081 How an HTTP request works: methods, headers, and body An HTTP request is a short text message a client sends to a server: a method and path, some headers, and sometimes… Beginner · Concept · Any system Article Making requests 15 Oct 2026
0082 HTTP status codes: the common ones and what to do A quick reference to the HTTP status codes you will meet most often, what each one means, and the first thing to… Beginner · Reference · Any system Article References · Status codes 15 Oct 2026
0086 API authentication basics: API keys, Bearer tokens, and OAuth How APIs know who is calling: static API keys, Bearer tokens in the Authorization header, Basic auth, and a high-level tour of… Intermediate · Concept · Any system Article Authentication 15 Oct 2026
0087 CORS explained: why the browser blocks your request CORS is the browser rule that decides whether JavaScript on one origin may read a response from another. The server opts in… Intermediate · Concept · Browser Article Async code · Making requests 15 Oct 2026
0088 Fix: Access to fetch at ‘…’ from origin ‘…’ has been blocked by CORS policy The browser refused to give your script a cross-origin response because the server did not send the right Access-Control-* headers. Fix it… Intermediate · Fix · Browser Article Common errors · Making requests 15 Oct 2026
0089 Fix: 413 Request Entity Too Large A server or proxy rejected your request because its body is bigger than the configured limit. Find which layer set the limit,… Intermediate · Fix · Any system, Linux Article Status codes · Web frameworks 15 Oct 2026
0090 Flexbox and CSS Grid: laying out a page Flexbox arranges items along one line, Grid arranges them in rows and columns at once. Learn the handful of properties that cover… Beginner · How-to · Browser Article Layout 15 Oct 2026
0091 CSS selectors and specificity reference The selectors you will use every day, how the browser decides which rule wins when several match, and practical ways to keep… Intermediate · Reference · Browser Article References · Selectors & specificity 15 Oct 2026
0092 Semantic HTML and accessibility basics, with a responsive page skeleton A minimal responsive HTML page built from semantic elements, plus the accessibility basics every page needs: headings, labels, alt text, keyboard focus,… Beginner · How-to · Browser Article Accessibility · Layout 15 Oct 2026
0098 What Proxmox VE is: KVM virtual machines, LXC containers and a web UI Proxmox VE is an open source virtualization platform based on Debian. It runs KVM virtual machines and LXC containers and is managed… Beginner · Concept · Linux Article Basics · Installation & first steps 15 Oct 2026
0099 Proxmox VE repositories and updates: enterprise vs no-subscription A fresh Proxmox VE install uses the enterprise repository, which needs a subscription. Learn how to switch to the no-subscription repository and… Beginner · How-to · Linux Article Installation & first steps · Packages & updates 15 Oct 2026
0100 Create a VM and a cloud-init template with qm Create KVM virtual machines from the command line with qm, then build a reusable cloud-init template from a cloud image and clone… Intermediate · How-to · Linux Article Basics · VMs & containers 15 Oct 2026
0101 Create LXC containers with pct and pveam Download a container template with pveam, create an unprivileged LXC container with pct, give it a network address and get a shell… Beginner · How-to · Linux Article VMs & containers 15 Oct 2026
0102 Proxmox VE storage types: local, LVM-thin, ZFS, NFS and Ceph Proxmox VE stores disks, ISOs, templates and backups in storage pools defined in /etc/pve/storage.cfg. Learn the main storage types, what local and… Intermediate · Concept · Linux Article Disks, LVM & filesystems · Storage 15 Oct 2026
0103 Proxmox VE networking: Linux bridges (vmbr0) and VLANs Guests reach the network through Linux bridges such as vmbr0, defined in /etc/network/interfaces. Learn the default setup, VLAN-aware bridges, VLAN tags for… Intermediate · How-to · Linux Article Installation & first steps · Networking & firewalls 15 Oct 2026
0104 Build a Proxmox VE cluster with pvecm and live-migrate VMs Join Proxmox VE nodes into a cluster with pvecm create and pvecm add, check quorum with pvecm status, then move running VMs… Advanced · How-to · Linux Article Clusters & high availability · VMs & containers 15 Oct 2026
0105 High availability in Proxmox VE: HA resources, fencing and affinity rules Proxmox VE HA restarts VMs and containers on another node when a node fails. Learn the requirements, how watchdog fencing protects your… Advanced · Concept · Linux Article Clusters & high availability 15 Oct 2026
0106 Back up and restore guests with vzdump, backup jobs and Proxmox Backup Server Back up Proxmox VE VMs and containers with vzdump, choose a backup mode, schedule backup jobs with retention, restore with qmrestore or… Intermediate · How-to · Linux Article Backup & restore 15 Oct 2026