tl;dr:

Go to search.brave.com

Search for “docker cheat sheet”

Write it down

Then search “How to install docker on (Your current OS)”

Click on whatever link appears first, blindly follow the step by step

Then search “Best things to self-host”

Check the first two links, see if something tickles your fancy

Then search for “How to install (ticklyfancy stuff) on docker”

Once again, blindly follow the step by step

Congrats! You are now a pro docker user.