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Java is an object orientated language, and understanding the fundamentals of classes and objects in Java is absolutely key.
A few recommended videos can be found below:
Primitives and Objects: (Caleb Curry) >> https://youtu.be/r4wWYgkBcpI
Objects and Classes: >>https://youtu.be/MDLK8PyrkwY?list=PLmpmyPywZ443PFI8YF3ZMmoEcRfxXckdH