I was wandering if anyone had any advice on what scales i should learn (I am into hard rock/metal)
everything, metal uses just about every scale out there, major, minor, harmonic and melodic minor, diminished scale, all the modes

thatll keep you busy for like...the rest of your life
Quote by beadhangingOne
There is no music but metal and muhammad is its prophet.
Major scale modes, melodic minor scale modes, harmonic minor scale modes, half-whole diminished scale, whole-half diminished scale, wholetone. Plus all the chords and progressions that go with them.

Have fun.
He who joyfully marches to music in rank and file has already earned my contempt.
He has been given a large brain by mistake, since for him the spinal cord would fully suffice.

Remember: A prudent question is one half of wisdom.

And of course, make sure that you KNOW what each scale SOUNDS like, and try to identify what someone else is playing.
"Physics is like sex. Sure, it may give some practical results, but that's not why we do it." - Richard Feynman