Yes that is a common problem. I could see GitHub creating tools to help you select a license and inform you how to use it properly, as well as having systems that show you how the license affects your project.
It's not under the github.com domain, but they did create it. IIRC they link to it somewhere when you go to create a new repo, along with a drop down to select what license you want (Assuming you're not just pushing an already created repo).
I think it is a good request though. I'm fond of MIT, but with the right wizard, I may also find that GPL or something else may be a better fit for what I'm working on.