I have several years of Linux experience and I know how to fix my own problems, and I have experience self-hosting using Docker and Docker Compose, but I really feel that I don’t know how to self-host and that I just copy and paste commands without understanding it, I would really like to learn how to self-host by myself but I don’t know how I can start or with what resources for newbies I can start with.
I am interested in self-hosting several services, but the one I am currently most interested in is changedetection.io, as there are multiple such services but they all require a membership fee, and I prefer to self-host on my own.
Start with a simple, basic service. Think of something like a web server or ntp. Understand how these services affect your environment with respect to security, performance, availability, maintenance, backups, other services, firewalls, routing, DNS, monitoring and notification, documentation, change control, etc. Those are the hard parts of hosting and if you find ways to be effective with a simple service the others will be less daunting.