create_merge_branches

-Go to the starting point of the project
>> git checkout origin master
-Create and checkout your branch
>> git checkout -b [branch]
-Make changes
>> git commit -a -m"commit messages"
-Push the changes to the remote if you want review, so on
>> git push origin [branch]
-Go back to the branch you want to merge to
>> git checkout master
>> git merge [branch]
-Resolve conflicts
>> git push origin master

ex.
git checkout origin master
git checkout -b release_a
-make changes
git commit -a -m"changed config"
git checkout master
git merge release_a
git push origin master