What license are you using for your code? See choosealicense.com for help deciding. It’s a convention to save a file LICENSE in the root of your Git repo that contains the license text.
What license are you using for the written content on your site? It is traditional to choose a Creative Commons license for this type of content.
How should others cite your work? It’s a convention to save a file CITATION in the root of your Git repo that contains the citation information.