Welcome to the community 
Glad that you are getting to try Solidity development.
Everyone was new once and not that long ago (What are your top three recommendations for a new developer in the space?)
A great way to track your progress is to keep a record of it. You could do your own version of in the forum: My Coding Journey: Beginner to Pro
From your error, it looks like you don’t have Git installed
https://git-scm.com/download/linux
I would also suggest looking to change your node version. I use node 10 daily and node 12 should work too. Using node 13 you may run into issues with ecosystem support.
You may want to look at using nvm for this to easily change node versions.