Rvalues and Lvalues?

I was wondering if you guys can help me get a better understanding of rvalues and lvalues. I know that lvalues can be used either left-handed or right-handed but I'm not sure what actually classifies as lvalues and rvalues. I've been looking all over for examples and explanations but haven't found anything useful. Can you guys give me examples to help me easily identify them? I would like to implement them in code someday but I am not sure how.
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