Answers for "how to connect to existing git repository"

git push existing repo

cd existing_folder
git init
git remote add origin https://gitlab.com/abc.git
git add .
git commit -m "Initial commit"
git push -u origin master

push an existing repository from the command line

git remote add origin https://github.com/Gnaore/sigpef_api.git
git branch -M main
git push -u origin main

…or push an existing repository from the command line

git remote add origin https://github.com/davidotu/myfinal_project.git
git branch -M main
git push -u origin main