I'll let the others continue their guidance on the how of OO, but I wanted to point out the one piece of information which transformed my understanding of OO. I believe it came from Thinking in Java (for me, second edition).
The tutorials also do not show the data being munged up front...
That's because the very point of Object Oriented programming is to not think about the data object in terms of the data and how to store and move it, but to think of it as the real world thing it is supposed to represent.
Edit: s/data/object/
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