Is it normal to struggle with classes, objects, methods?

Yes. Everyone struggles at first with not just those concepts, but all programming concepts. It is completely normal and you would be odd if you didn't struggle. Programming is a language in and of itself, and while not as complicated as learning a foreign spoken language, still requires time and LOTS of practice to start to understand and become proficient in its use. I recommend not worrying too much about those topics and focus on learning what is being taught as it is being taught. Getting ahead of yourself is going to lead to unnecessary confusion. So, some tips: #1 practice, practice, practice #2 don't level up too fast. Without practice you will be behind. #3 do get a good book to supplement your learning. I can personally recommend "Thinking in Java" by Bruce Eckel, however that is not the only book out there. Almost any book will have more in depth lessons than Codegym, and they will have their own tasks to practice with (though no validation). #4 Codegym gives code that solves tasks you can simply download. I don't recommend using this on a task until after you have personally solved that task. Programming is problem solving and not figuring out how to problem solve is going to hurt you in learning to program. Ask for help if need be. #5 Check out this forum post I made a while back with a bunch of generic videos on programming. I recommend the first one and then the 2 on sorting algorithms. The last one is a fun video and is a good watch P.S. You can download the previous addition of the book I mentioned above completely free from the distributor