sudo apt-get install git

git config --global user.name "user_name"
git config --global user.email "email_id"

git init "repo_name"
cd "repo_name"

gedit README, write something

git add README

git rm file_name  # remove file_name from local and repo
git rm --cached file_name  # remove file_name from repo ONLY

git status

git commit -m "note"

git remote add origin https://github.com/user_name/repo_name.git

git push -u origin master

git pull origin master

git diff

git branch branch_name

git branch -d branch_name

git checkout branch_name

git branch des_branch # switch to destination branch (the branch to be merged)
git merge src_branch # merge (des_branch will be a copy of src_branch)

$ git config credential.helper store
$ git push http://example.com/repo.git
Username: <type your username>
Password: <type your password>