The main branch is downloaded by default the first time you download the code. It is master

Developers have to:

git checkout master
git pull
git branch master
git checkout master
...
...
git add files_you_have_worked_on.cc
git commit -m "new point in the history, this is a comment to make clear which are the changes"
...
...
git add files_you_have_worked_on.cc
git commit -m "another commit"
# to make sure what you did works
scram b -j16 
git push origin myWorkingBranch:myWorkingBranch
git checkout master

GIT LONG instructions: https://github.com/CMSROMA/gitTest

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