Rejected error on push repository in Gitlab

Question

I want to push some test file to the myfirstgittrial project on GitLab.

When i run this git push origin master command on ubuntu terminal I got this error

To git@gitlab.com:RamS20_2/myfirstgittrial.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'git@gitlab.com:RamS20_2/myfirstgittrial.git'
hint: Updates were rejected because a pushed branch tip is behind its remote
hint: counterpart. Check out this branch and integrate the remote changes
hint: (e.g. 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

And my Origin value is

origin  git@gitlab.com:RamS20_2/myfirstgittrial.git (fetch)
origin  git@gitlab.com:RamS20_2/myfirstgittrial.git (push)

Answer 1

The Error clearly says your branch is behind, So first do

1. git pull

2. git add.
3. git commit -m "message"
4. git push origin master or git push

Hope this helps