What kind of yamaha keyboard should I get?

People are telling me to get it with weighted keys..so I’ll do that, but what are weighted keys?
And how many keys do you think should be on my keyboard?
And someone else told me Y!A, that I should get one with 7 octaves.. if I want to play like a real piano.. so what else?

And if you have any great yamaha keyboards out there, show me them !

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