git branch --unset-upstream master_old
                    

                      git branch --unset-upstream master_old
                    

                      //add untracker file or folder
git rm -rf --cached myuntrackedfolder
                    

                      Make changes in . gitignore file
Run git rm -r --cached . command
Run git add . 
git commit -m "Commit message" or just git commit or continue working.
                    

                      git branch --merged master --no-color | grep -v "master\|stable\|dev" | xargs git branch -d

//delete all branches except for the current branch
git branch | grep -v $(git rev-parse --abbrev-ref HEAD) | xargs git branch -D
                    

                      //will list your local branches and show information about the remote branch, saying “gone” if it is not present anymore.
git branch -vv
                    

                      /tmp/
/.idea/
/.vscode/
/ui/img/*
/ui/video/*
/uploads/*
config.ini

                    

                      # -----------------------------------------------------------------
# .gitignore for WordPress
# Bare Minimum Git
# http://ironco.de/bare-minimum-git/
# ver 20150227
#
# This file is tailored for a WordPress project 
# using the default directory structure
#
# This file specifies intentionally untracked files to ignore
# http://git-scm.com/docs/gitignore
#
# NOTES:
# The purpose of gitignore files is to ensure that certain files not
# tracked by Git remain untracked.
#
# To ignore uncommitted changes in a file that is already tracked,
# use `git update-index --assume-unchanged`.
#
# To stop tracking a file that is currently tracked,
# use `git rm --cached`
# -----------------------------------------------------------------

# ignore everything in the root except the "wp-content" directory.
/*
!wp-content/

# ignore all files starting with .
.*

# track this file .gitignore (i.e. do NOT ignore it)
!.gitignore

# track .editorconfig file (i.e. do NOT ignore it)
!.editorconfig

# track readme.md in the root (i.e. do NOT ignore it)
!readme.md

# ignore all files that start with ~
~*

# ignore OS generated files
ehthumbs.db
Thumbs.db
.vscode

# ignore Editor files
*.sublime-project
*.sublime-workspace
*.komodoproject

# ignore log files and databases
*.log
*.sql
*.sqlite

# ignore compiled files
*.com
*.class
*.dll
*.exe
*.o
*.so

# ignore packaged files
*.7z
*.dmg
*.gz
*.iso
*.jar
*.rar
*.tar
*.zip

# Ignore everything in the "wp-content" directory, except the "plugins"
# and "themes" directories.
wp-content/*
!wp-content/plugins/
!wp-content/themes/

# Ignore everything in the "plugins" directory, except the plugins you
# specify (see the commented-out examples for hints on how to do this.)
wp-content/plugins/*
# !wp-content/plugins/my-single-file-plugin.php
!wp-content/plugins/woocommerce/


# ignore these plugins
wp-content/plugins/hello.php

# ignore specific themes
wp-content/themes/twenty*/

# ignore node/grunt dependency directories
node_modules/