Simple way to rebase and merge the branch into other branch/master in git is going to explain by some steps:
1. Go to your Branch. // which you want to merge... in Git bash
2. git rebase master_branch_name // underline word will be your master or other branch where you want to upload.
This rebase will push your commits to top of the master/other branch..
3. Then pull and push the code by git desktop software.
4. Then go to the master or head branch (git checkout branch name)
5. git merge your_branchname // underline word will be your lower branch name.
Note: If have any suggestions or issue regarding 'How to rebase and merge in master or other branch in git?' then you can ask by comments.
