To merge changes from one Git branch into another, follow these steps:
Ensure that you are on the branch that you want to merge the changes into. For example, if you want to merge changes from branchA into branchB, make sure you are on branchB.
git checkout branchB
Use the git merge command followed by the branch that you want to merge. In this case, it's branchA.
git merge branchA
Git will attempt to automatically merge the changes. If there are any conflicts, you will be notified and you will need to resolve them manually.
After resolving any conflicts, commit the changes with a merge commit.
git commit -m "Merge branchA into branchB"
If you want to keep your branches up to date, it's a good practice to push your changes to the remote repository.
git push origin branchB
That's it! The changes from branchA should now be merged into branchB. Remember to double-check the changes before pushing them to ensure that everything is as expected.