Finally I decided to write all codes of GIT that I need and I should search for them every time.
Here you are, some of most important and useful codes you need to know for daily works.
information of active branch and changed files
create a new branch and switch to it
git checkout -b [branch_name]
get the list of branches
delete an existing local branch
git branch -d [branch_name]
update master branch
git checkout master git pull
update a branch with master
git checkout [branch_name] git merge master
add files to stage
git add [file_name] OR git add . // all files
commit staged files
git commit -m "[message for commit]"