When I make hard turns I hear like a knocking sound in the rear where the wheels are, Im guessing that its my struts, but im not fully sure.

You need to get a good look under there and see what you can see.

there are many things back there that can come loose or wear out, lash is right, you need to get the car up on a lift or jackstands and strat wiggling and banging around until you find something amiss

And ensure there'* nothing large sliding around in your trunk

Lol!

But seriously, it wouldn't be the first time someone discovered that a jack or something got loose and was banging around back there...

I checked and theres nothing loose I found out that my left rear wheel kind of leans out a lil bit. I pushed up and down on the rear end of the car and it made a "grudging" noise so it must be my struts.

also, i wanted to know if it would do any harm if my stabilizer pins are to tight.