It varies from person to person to learn Object Oriented programming. Some people get the concept of "Objects" quickly, but most people are used to "procedural" thinking, because that is how we see things happening, in a sequential order... time wise. I am not sure how many people can say they mastered object oriented programming, but if you want to study advanced techniques, try search for "design patterns". They are proven good solutions to well known problems and are usually in Object Oriented thinking in today's world, until another prgramming technique comes along.

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