Git global setup

git config --global user.name "User Name"
git config --global user.email "user@example.com"

Create a new repository in Git

git clone https://gitlab.abc.de/username/project.git
cd bmln
git switch -c main
touch README.md
git add README.md
git commit -m "add README"
git push -u origin main

Push an existing folder

cd existing_folder
git init --initial-branch=main
git remote add origin https://gitlab.abc.de/username/project.git
git add .
git commit -m "Initial commit"
git push -u origin main

Push an existing Git repository

cd existing_repo
git remote rename origin old-origin
git remote add origin https://gitlab.abc.de/username/project.git
git push -u origin --all
git push -u origin --tags