How much do I need to know to be able to get a job as a junior

I'll bump now and tomorrow to see if someone helped OP.

Look for offers that require less than 2 years of exp and see what you are missing, try working on that. In the meanwhile try applying anyway. Companies often hire people like you and teach them how to do stuff. If you fail, ask why they don't like you and fix that and try somewhere else.

You might want to try making a small open source project. Just something small and simple to show people that you can code and know how to use git.