How to update your branch from master git?

Question

git

Hey!
I would be grateful for help with git .
There is an a branch, and there is a master branch.
In the master working version.
When you try to merge: git merge a (we are in the master branch), everything goes fine, but when you switch to the a branch, the application stops working correctly. I would like to upload to the branch and the actual working code from the master branch.
I understand that you can create a new branch based on master, but I want to update the branch a
Thanks in advance

Answer 1

git checkout a
git merge master