Failed to push some refs

jatin@HP14s-dk0501AU MINGW64 ~/Githubonlinejtn (main)
$ git remote add origin https://github.com/Jatin1434Walia/Githubonlinejtn.git
error: remote origin already exists.

jatin@HP14s-dk0501AU MINGW64 ~/Githubonlinejtn (main)
$ git push -u origin main
error: src refspec main does not match any
error: failed to push some refs to ‘https://github.com/Jatin1434Walia/Githubonli
inejtn.git’

jatin@HP14s-dk0501AU MINGW64 ~/Githubonlinejtn (main)
$