GIT

#---- Existing project add in a new repo -------------//
go to project folder
git init
git add folder/file
git commit -m "init"
git remote add origin repo_url
git push -u origin master

#---- gitignore for already added file/directory: -------------//
Create .gitignore file and put directory/file there
for example node_modules/
Then run below cammand
git rm -r --cached .
git add .
git commit -m ""