To dockerize an application: where to start learning.

I've recently started a crusade for the perfect selfhosted note taking app.

I posted here and I read a lot of others posts and for now I think I have what I need.

But as I see Joplin recommended every now and then, and given it doesn't offer a webui I can access everywhere from any computer (you need to install their app), I had this thought: how could I dockerize, say, the Linux Joplin app so I can put it behind a reverse proxy with auth and access it when I'm away from home from any computer.

I've seen this done for soulseek, mkvtoolnix and others, so I know it is feasibile.

Being just a hobbyist selfhoster with no programming background, I'm not sure where to start educating myself.

I'm sure there are some guides out there, but I'm not sure what to look for, what terms to use in my searches.

Somebody could point me to the right direction?