When studying for classes, flashcards have always been useful for memorization and reinforcement of terms and definitions. I have found flashcard machine to be a great resource for this common study procedure. It’s interface is user-friendly and creating an account is completely free.
https://www.flashcardmachine.com/
Another great tool that I have used throughout college is Knowledge Net. This website is tailored to students interested in learning about the IT sector and has free resources to gain more in-depth knowledge.