This activity relies on a basic understanding of git branching. A good place to learn some basics is this helpful guide.
A common "gotcha" that new learners make is forgetting to add and commit before switching branches, if you forget to do this your changes will move from the old branch to the new branch, which is NOT what you want.
You'll notice that there are no files or challenges at the moment. Each one of these challenges are separated by a branch in git and will be released periodically, you are currently in the master branch and can switch to the first challenge by running the command git checkout -b first-branch in your terminal inside this git repository.
Once you have switched branches, you need to run the command git pull origin first-branch, what we are doing is downloading everything from the 'first-branch' branch on the github repository, we've named the github branch and your local branch the same name to reduce some confusion. After you've done that, you'll be able to see a new markdown file with the next instructions.
Remember that if you forget what to do after switching branches, you can run the command git checkout master to come back to this branch.