Alguien vs nadie vs alguno vs ninguno vs cualquier

Hi so I know that Alguien and nadie are opposite to eachother and so is alguno and ninguno, I know what they mean just not when or what situtation you would use them in, all I know is that alguien and nadie are used when referring to people and alguno and ninguno as used as adjective, and I don't know about cualquier, I'd love some help on these, thanks in advance. I would also like to know when to use cualquier or cualquiera, thanks again.

submitted by /u/blackiechan1053
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