Creating

git checkout -b $branchname
git push origin $branchname --set-upstream

Creates a new branch locally then pushes it.

Getting from remote

git fetch origin
git checkout --track origin/$branchname

Gets a branch in a remote.

Delete local remote-tracking branches

git remote prune origin

Deletes origin/* branches in your local copy. Doesn’t affect the remote.

List existing branches

git branch --list

Existing branches are listed. Current branch will be highlighted with an asterisk.

List merged branches

git branch -a --merged

List outdated branches that have been merged into the current one.

Delete a local branch

git branch -d $branchname

Deletes the branch only if the changes have been pushed and merged with remote.

Delete branch forcefully

git branch -D $branchname

git branch -d $branchname

Note: You can also use the -D flag which is synonymous with –delete –force instead of -d. This will delete the branch regardless of its merge status.
Delete a branch irrespective of its merged status.

Delete remote branch

git push origin --delete :$branchname

Works for tags, too!

Get current sha1

git show-ref HEAD -s

Reset branch and remove all changes

git reset --hard

Undo commits to a specific commit

git reset --hard $commit_id

# Now push safely to your branch
git push --force-with-lease

# Or push brutally to your branch
git push --force