If you want to possibly learn more or if this website doesn’t appeal to you, you can visit the following websites:
Chess.com has over 15 million members, and is a great way to learn about chess and tactics that ChessPrinciples doesn’t cover. You can also play live online chess with people around the world, and put your knowledge to the test. For the most part, it’s free.
Similar to Chess.com, lichess teaches the basics of chess in a simplified and organized way, and it can be used to play other people anonymously, against a computer, or against a friend.
ChessPrinciples 