Dan Shiffman’s playlist below is an excellent introduction to classes / OOP.
When I was first learning this, I watched these multiple times, took notes, and copied and ran the example(s) he provided.
Keep in mind OOP is a conceptual leap in how you will be thinking about the overall structure of your programs going forward. It may not make total sense at first, but Shiffman breaks down the steps into very digestible pieces. 
You could also watch the tutorial(s) on Happy Coding (another excellent resource) here:
But IMHO, start with the Shiffman series on this one. The combination of both spoken and written information makes it a bit easier as an introduction.
