for avoiding conflict branches in the future, you should make checkout to master first, make a new branch, then you ca check out to it.
```bash
git checkout master
git branch <new-branch> #name it as you wish
git checkout <new-branch>
```
Or you could possibly as a shortcut do this by one command
```bash
git checkout master
# `-b` option will make a new branch and it will switch to it.
git checkout -b <new-branch> #name it as you wish
```
Or even shorter, with online you could do it as:
```bash
# `-b` option will make a new branch and it will switch to it.
# new-branch it could be `week2` and source-branch could be `master` in your case because we need to checkout from the master branch.
git checkout -b <new-branch> <source-branch>
```