git usage

• git init
  Create an empty Git repository or reinitialize an existing one. Running git init in an existing repository is safe. It will not overwrite things that are already there.

• git add
  This command updates the index using the current content found in the working tree, to prepare the content staged for the next commit.

-git commit
Stores the current contents of the index to repository, along with a log message from the user describing the changes.