Git

Add remove git tags.

Create a tag

git tag <TAGNAME>

Push tag

git push origin <TAGNAME>
git push --tags

Pull tags

git tag -l
git checkout tags/<TAGNAME>

Delete local tag

git tag -d <TAGNAME>

This is the brute-force method. It also removes the configuration of the repository.

Step 1: remove all history
rm -rf .git

1 Ignore files And Folders using .gitignore Files (Include and/or Exclude)

Create the gitignore file at the top of your repository,i f it's not already exist
To Exclude A file/folder just add file path or the directory path like:

Create Patch:
git diff PATH/TO/SOURCE.php > PATH/SAVE_patch.diff

Apply patch
git apply PATH/SAVE_patch.diff

More Info : http://www.thegeekstuff.com/2014/03/git-patch-create-and-apply/

1. Remove Files

Step 1. Switch to your branch
Strp 2. Remove files using -rm command
Ex :  git rm -r sites/all/modules/stage_file_proxy
Step 3. Add this file to the .gitignore

Ignore files and folders using .gitignore

Example 1. Ignore (Exclude) a simple file or a folder
sites/default/settings.php
sites/*/files

git checkout -b // TO TEST

git branch <branche>  // TO TEST

#Download / Get git repository
git clone http://url-of-your-git/project.git

#Show remore url
git remote -v