what kind of bike should i get for downhill mountain biking and also be able to do tricks?

i want to get a bike that i could use mountain biking. but i also want to be able to go to the park and learn tricks and stuff. i don’t know much about bikes, but i’ve always wanted to get into it. I’m 5’8″ and i don’t know if there’s some sort of size specification. any help would be great. i want to spend less than $500. thanks.

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