For exercise, take some time to visit www.musictheory.net (I will direct you to the exact link in a second), to work on finding the keys on the keyboard. First, Click Here to access the exercise in a separate tab. Then, once you visit the site, go to the top right and click on the little icon to the right of the "i". A "customize" drop-down menu will appear. In the menu bar, click on is where it says "Keys". Make sure you only check off the letters you've been given so far (uncheck all of the ones with the funny symbols next to them). Then you can go back into the exercise and work on the keys from there.