I’ve learned everything through google lol.
I use the template editor a ton to try things out, and open that jinja2 website and see what things do. But even then it’s super confusing.
I used this post a ton with learning different things that could be done. Just trying out the different things in the template editor and modifying things to see what would output, etc.
Also I learn a lot by helping people here. I usually have some janky solution and someone else comes along and says “you can do that 1000 line jank in 2 lines like this”. I think I’m now at the point where I’m the one giving the 2 line solutions these days. Only took me a year!