Catalogue map

Every area, topic and subtopic, with how many entries exist at each level and of each kind. Pick a number to open exactly those entries.

Tutorial: A guided project from start to finish.
Concept: Explains how something works.
How-to: Steps to get a task done.
Reference: A cheat sheet to look things up.
Fix: An error message and how to solve it.; Repos have no level or kind, so those columns can add up to less than All.

Entries per topic, by level and kind
Class	Topic	Beg.	Int.	Adv.	Tutorial	Concept	How-to	Ref.	Fix	Articles	Scripts	Repos	All
		Level			Kind					Type
1	Languages	15	14	3	2	7	13	4	6	21	11	10	42
1.1	Python	9	6	1	1	3	7	2	3	11	5	5	21
1.1.1	Basics	1	none	1	none	1	none	1	none	2	none	none	2
1.1.2	Environments & packages	3	1	none	1	1	1	none	1	3	1	1	5
1.1.3	Files & automation	4	4	none	1	1	5	1	none	4	4	1	9
1.1.4	Testing	1	1	none	1	none	1	none	none	2	none	2	4
1.1.5	Common errors	3	none	none	none	none	none	none	3	3	none	1	4
1.2	JavaScript	5	8	2	1	3	6	2	3	9	6	4	19
1.2.1	Basics	4	none	none	none	1	none	2	1	4	none	none	4
1.2.2	Async code	none	3	2	none	2	3	none	none	2	3	1	6
1.2.3	Patterns	none	1	none	none	none	1	none	none	none	1	1	2
1.2.4	Node.js	1	3	none	1	none	2	none	1	2	2	2	6
1.2.5	Common errors	1	2	none	none	none	none	none	3	3	none	none	3
1.3	TypeScript	1	none	none	none	1	none	none	none	1	none	1	2
1.3.1	Basics	1	none	none	none	1	none	none	none	1	none	1	2
1.4	Regular expressions	1	none	none	none	none	none	1	none	1	none	none	1
1.4.1	Basics	1	none	none	none	none	none	1	none	1	none	none	1
2	Version control	8	6	1	2	3	5	2	3	12	3	4	19
2.1	Git	5	5	1	1	3	3	1	3	9	2	1	12
2.1.1	Setup	3	none	none	1	1	1	none	none	2	1	none	3
2.1.2	Branching & rebasing	1	2	none	1	1	none	none	1	3	none	none	3
2.1.3	Undoing changes	none	1	none	none	1	none	none	none	1	none	none	1
2.1.4	Finding bugs	none	none	1	none	none	1	none	none	1	none	none	1
2.1.5	Housekeeping	1	1	none	none	1	1	none	none	1	1	1	3
2.1.6	Reading history	none	none	1	none	none	1	none	none	1	none	none	1
2.1.7	Common errors	1	2	none	none	none	none	none	3	3	none	none	3
2.2	GitHub & collaboration	3	1	none	2	none	2	none	none	4	none	1	5
2.2.1	Pull requests	2	none	none	1	none	1	none	none	2	none	1	3
2.2.2	GitHub Actions	1	1	none	1	none	1	none	none	2	none	none	2
2.3	Git tools	1	none	none	none	none	none	1	none	none	1	4	5
3	Shell & command line	6	10	2	2	3	6	4	3	10	8	5	23
3.1	Shell & Linux	5	6	1	1	3	4	3	1	6	6	none	12
3.1.1	Basics	4	none	none	none	3	none	1	none	4	none	none	4
3.1.2	Finding files & text	1	1	none	none	none	2	none	none	1	1	none	2
3.1.3	Text processing	2	1	none	none	1	2	none	none	2	1	none	3
3.1.4	Shell scripting	none	5	1	1	none	2	2	1	1	5	none	6
3.1.5	Backups & syncing	none	none	1	none	none	1	none	none	none	1	none	1
3.1.6	Processes & ports	none	1	none	none	none	none	none	1	none	1	none	1
3.2	Command-line tools	1	1	none	none	none	none	2	none	1	1	5	7
3.3	SSH & servers	1	3	1	1	none	2	none	2	4	1	none	5
3.3.1	Keys & config	1	2	1	1	none	2	none	1	3	1	none	4
4	Systems & infrastructure	28	54	16	11	21	38	14	14	85	13	15	113
4.1	Linux administration	7	13	2	3	4	9	4	2	19	3	2	24
4.1.1	Services & systemd	1	6	none	2	1	2	1	1	6	1	1	8
4.1.2	Disks, LVM & filesystems	1	4	1	none	2	2	1	1	4	2	none	6
4.1.3	Networking & firewalls	2	4	none	1	none	3	1	1	6	none	1	7
4.1.4	Packages & updates	3	none	none	1	none	1	1	none	3	none	none	3
4.1.5	Users, sudo & hardening	2	none	1	1	1	1	none	none	2	1	none	3
4.2	Containers	1	2	none	1	1	1	none	none	3	none	none	3
4.2.1	Docker basics	1	2	none	1	1	1	none	none	3	none	none	3
4.2.2	Docker Compose	none	2	none	1	none	1	none	none	2	none	none	2
4.3	Proxmox VE	5	8	3	1	3	7	2	3	14	2	2	18
4.3.1	Installation & first steps	3	1	none	1	1	2	none	none	4	none	1	5
4.3.2	VMs & containers	3	4	1	1	none	3	2	2	7	1	1	9
4.3.3	Storage	none	1	none	none	1	none	none	none	1	none	none	1
4.3.4	Clusters & high availability	none	1	3	none	1	1	1	1	4	none	none	4
4.3.5	Backup & restore	2	2	none	1	none	2	none	1	3	1	none	4
4.4	Oracle Private Cloud Appliance	2	5	1	none	3	4	1	none	8	none	1	9
4.4.1	Architecture & concepts	2	none	none	none	2	none	none	none	2	none	none	2
4.4.2	Compute, networking & storage	1	4	none	none	1	4	none	none	5	none	1	6
4.4.3	Administration & monitoring	none	1	1	none	1	none	1	none	2	none	none	2
4.5	KVM & libvirt	3	5	1	1	2	3	2	1	8	1	2	11
4.5.1	Basics	3	5	1	1	2	3	2	1	8	1	2	11
4.6	Kubernetes	6	11	3	2	5	7	2	4	18	2	3	23
4.6.1	Concepts	5	none	1	1	3	1	1	none	6	none	1	7
4.6.2	Workloads & services	3	1	2	1	1	2	none	2	6	none	none	6
4.6.3	Config, secrets & storage	none	3	1	none	1	3	none	none	4	none	none	4
4.6.4	Ingress & networking	1	2	none	none	1	2	none	none	3	none	none	3
4.6.5	Troubleshooting	1	4	2	none	none	1	2	4	5	2	1	8
4.6.6	Helm	none	2	none	1	none	1	none	none	2	none	1	3
4.7	OpenShift & OKD	3	8	3	1	3	6	2	2	12	2	2	16
4.7.1	Concepts	2	2	1	1	3	1	none	none	5	none	1	6
4.7.2	Deploying applications	2	6	none	1	none	6	1	none	7	1	1	9
4.7.3	Cluster administration	none	2	2	none	2	none	1	1	3	1	1	5
4.7.4	Troubleshooting	none	3	2	none	none	1	2	2	3	2	none	5
4.8	Automation & infrastructure as code	4	5	3	2	2	5	1	2	9	3	2	14
4.8.1	Ansible	2	4	1	1	1	3	1	1	5	2	1	8
4.8.2	Terraform	2	1	2	1	1	2	none	1	4	1	1	6
4.9	Monitoring & logging	none	4	none	1	1	1	1	none	4	none	2	6
4.9.1	Prometheus & Grafana	none	3	none	1	1	1	none	none	3	none	2	5
4.9.2	Logs	none	1	none	none	none	none	1	none	1	none	none	1
5	Data	19	29	10	5	13	21	8	11	46	12	12	70
5.1	SQL	4	3	1	1	3	1	2	1	7	1	2	10
5.1.1	Queries	4	2	none	1	1	1	2	1	5	1	2	8
5.1.2	Joins	2	1	none	1	1	none	1	none	2	1	none	3
5.1.3	Indexes & performance	none	none	1	none	1	none	none	none	1	none	none	1
5.2	CSV & JSON	4	1	none	none	1	2	1	1	2	3	1	6
5.2.1	jq & JSON on the command line	none	1	none	none	none	none	1	none	none	1	1	2
5.3	Data analysis	none	1	none	none	none	1	none	none	1	none	2	3
5.4	PostgreSQL	4	9	3	2	3	6	2	3	13	3	2	18
5.4.1	Install & connect	3	3	none	1	1	1	1	2	6	none	1	7
5.4.2	Roles & administration	1	5	none	1	1	1	2	1	5	1	none	6
5.4.3	Backup & restore	1	2	1	1	1	2	none	none	3	1	1	5
5.4.4	Performance & tuning	none	2	none	none	1	none	1	none	1	1	none	2
5.4.5	Replication & high availability	none	none	3	none	1	2	none	none	2	1	none	3
5.5	MySQL & MariaDB	3	2	3	1	2	3	1	1	7	1	2	10
5.5.1	Administration	3	1	2	1	none	3	1	1	5	1	none	6
5.5.2	Backup & restore	none	1	1	none	1	1	none	none	1	1	none	2
5.5.3	Replication	none	none	3	1	1	1	none	none	3	none	none	3
5.6	Oracle Database	1	5	1	none	1	3	1	2	5	2	1	8
5.6.1	Concepts & tools	1	2	none	none	1	none	1	1	3	none	1	4
5.6.2	Administration	none	5	1	none	none	3	1	2	4	2	none	6
5.6.3	Backup with RMAN	none	1	1	none	none	2	none	none	1	1	none	2
5.7	MongoDB	2	3	none	none	1	2	1	1	4	1	1	6
5.7.1	Basics	2	1	none	none	1	none	1	1	3	none	none	3
5.7.2	Administration	none	3	none	none	none	2	none	1	2	1	1	4
5.8	Redis	1	4	1	1	1	1	1	2	5	1	2	8
5.8.1	Basics	1	2	none	1	none	1	1	none	2	1	none	3
5.8.2	Administration & persistence	none	4	1	1	1	1	none	2	4	1	2	7
5.9	Database operations	4	10	2	none	4	7	none	5	14	2	none	16
5.9.1	Choosing a database	2	1	none	none	3	none	none	none	3	none	none	3
5.9.2	Security & access	2	8	2	none	1	6	none	5	11	1	none	12
6	Web	6	8	1	2	3	6	2	2	11	4	7	22
6.1	HTTP & APIs	3	7	1	1	3	4	1	2	7	4	3	14
6.1.1	Making requests	2	5	1	1	2	4	none	1	4	4	3	11
6.1.2	Status codes	1	2	none	1	none	none	1	1	3	none	none	3
6.1.3	Authentication	1	1	none	none	1	1	none	none	1	1	none	2
6.2	CSS	3	1	none	1	none	2	1	none	4	none	1	5
6.2.1	Layout	3	none	none	1	none	2	none	none	3	none	1	4
6.2.2	Selectors & specificity	none	1	none	none	none	none	1	none	1	none	none	1
6.3	HTML & accessibility	2	none	none	1	none	1	none	none	2	none	none	2
6.3.1	Accessibility	2	none	none	1	none	1	none	none	2	none	none	2
6.4	Web frameworks	none	1	none	none	none	none	none	1	1	none	3	4
6.5	References	1	1	none	none	none	none	2	none	2	none	1	3
	Whole catalogue	78	108	31	19	49	81	32	36	175	42	48	265

Missing a topic? Anyone can add one while writing an entry; trusted editors tidy the tree.