Practise

Here I am going to write some of the commonly used commands in git

Help

git config --list
git config --global user.name "[username]"
git config --global user.email "[emailAddress]" (By default the option is --local for that repo. We can also use --system to apply system wide)
git init (To initialize your present working directory)

git config --global alias.[aliasName] [command]

git status # using option -s will show in short
git log # using -p -2 will show code difference introduced in each commit 2 lines in each commit
git log --stat # will show stats by file wise in numerals (To see the change log or the history of the project)
git log --pretty=format:"%h - %an, %ar : %s" (Shows log in format specified)
git annotate [file] (Shows information about each line about hashes and author)

git add [file or directory] (Adds file or directory to staging area, if just included with -A option it adds all files in working directory)
git reset HEAD [fileName] (To unstage the adding)
git commit -m "[message]" (Take a snapshot of project with staged files, adding -a will skip staging of all files) (! To add some forgotten thing to latest commit)
git add [fileName]
git commit --amend (To unmodify the changes before staging)
git checkout -- CONTRIBUTING.md

git rm [fileName] (Removes file from repository and needs to be commited)
rm [fileName] (Removes file from directory but needs to be staged )
git rm --cached [fileName] (Removes file from tracking-[from staging or commited] but is still present in directory)

git diff [file] (Shows the difference between staged and modified file, if you add option --staged; then it shows the difference between staged and the last commit)
git diff [branch1]..[branch2]

For that create a new file called .gitignore and add , for detail see gitignore command (You can add filenames or patterns to ignore them while tracking them)

git mv [oldName] [newName] (To rename any file or directory)
git tag # tags are used to mark important (Lists the tags marked)
git tag [tagName] # creates lightweight tag, it's just alais to commit
git tag -a [tagName] -m "[message]" (Used to create a tag)
git show [tagName] (Shows information about tag)
git push [remoteName] [tagName] (Pushes tags which are not by default not pushed, including just --tags pushes all)

git remote (Gives list of remote repository(s), if included with -v gives details)
git remote add [nameOfRemote] [ssh,https url]
git remote rename [oldName] [newName]
git remote show [remoteName] (Shows details about remote repository)
git remote remove [repoName] (Removes the server url)