You can use this method if You are a beginner. You can add files using git add, example git add README, git add /*, or even git add *
Then use git commit -m "" to commit files
Finally git push -u origin master to push files.
When you make modifications run git status which gives you the list of files modified, add them using git add * for everything or you can specify each file individually, then git commit -m and finally, git push -u origin master
Example - say you created a file README, running git status gives you
$ git status
# On branch master
# Untracked files:
# (use "git add <file>..." to include in what will be committed)
#
# README