Install /Set up GIT

sudo apt-get install git  # for debian\ubuntu users
brew install git # for Mac users with Homebrew install

Tell git who you are i.e Git username setting for every repository on your computer

git config --global user.email "abc@example.com"
git config --global user.name "your name"

git config --global user.name . #confirm user

Setting your Git username for a single repository
Open Terminal.
Change the current working directory to the local repository where you want to configure the name that is associated with your Git commits.
Set a Git username:

$ git config user.name "vivek singh"
Confirm that you have set the Git username correctly:

$ git config user.name
> vivek singh

git config --list #to return list of all user.

~/.gitconfig #look for git config file

~/.gitignore #look for git ignore

git config --global color.ui true  #To add command to git terminal

Git:starting a repository
git init
git status
git add . # add all files
git rm --cached my-file.ts #to remove files from staging area
git reset <file-name>

commiting changes to git
git commit -m "comment details"
git commit -a -m "Do something once more"  #add modified file and comment them

how can you modify a file if you've already committed it?
git reset --soft HEAD^

Instead of resetting the HEAD and undoing the last commit, we can rectify a commit by using the "--amend" option when committing to a repository. Just add the remaining file to the staging area and then commit:

$ git add file-i-forgot-to-add.html
$ git commit --amend -m "Add the remaining file"

#pulling anf pushing from and to repository
git clone <clone>
git pull
git push -u origin master
git remote add origin <link>

#git commands for working woth branches
git branch
git branch branch-name #to add new branch
git checkout branch-name
git merge branch-name
git branch -d branch-name

git checkout -b development #create and switch to new branch

git log #to check all commits in repository

git show
Usage: git show [commit]
This command shows the metadata and content changes of the specified commit.

git checkout -- #which will checkout all the modified files

git reset --hard HEAD #to get rid of all the modifications made to tracked files made so far
// or
git reset --hard

git stash #alternate to above reset command
git stash will revert all the files to their previous version but whatever changes were made to these files will be saved in the stash list. This log can be seen using git stash list command.

git stash apply stash@{0}

git stash save  #This command temporarily stores all the modified tracked files.
git stash pop   #This command restores the most recently stashed files.
git stash list  #This command lists all stashed changesets.
git stash drop  #This command discards the most recently stashed changeset.

git clean -f -d #lots of untracked files or folders in the repository which you want to remove

git revert commitno #to revert committed files
git revert commitno --no-edit

git diff #git difference between two commits.

git command Alias

git add -A && git commit -m "new changes"
You can make an alias to this command in the Git using command below.

git config --global alias.c "!git add -A && git commit -m"
This will create a global alias c for command git add -A && git commit -m. Now you can use the command below

git c "new changes"