git

Git1: There was a time when apps were extremely buggy. People decided they needed backups! Version control, gives ability to revert to any state you want (before the adding login feature, previous version, etc)


commands:
init, status, add, commit, checkout, 
Concepts:
staged change, commitIds
 
 
 
Git2: 
Commands:
branch, log,
Concepts:
Branch
What is branch
Remote:
ssh-key, allows communication with your computer and identification. Sites such as Github, Gitlab, BitBucket are git compatible and allow for storage of new code versions. 
Stage: stage change between add and commit
Rebase master: Find common common commit Id between  master and current branch. Apply all of the new commits in master branch. Apply current branch’s commits.