How can I render a composition(s) from the command line? I've never used the python console before so I only know these commands from the documentation that I've looked up. But I've read that it can be a lot faster than just pressing ctrl+F12 because it doesn't need the GUI.. or something. I looked in other places as well but my brain started to melt from this programming nightmare thing. I also have multiple scenes that needs rendering, so if I could do them one after another, it would be a plus. So if someone could show a command that let's me render my animation(s) in the compositor from the command line, it would be most appreciated!
there is already a previous question about creating render queues.

The Blender Manual also has a section about command line rendering if there are any specific commands you need to add.