not sure if this is the right place for this, but i need some help.

i've been playing for about a year/year & a half, & i'm starting to get into writing my own stuff. writing riffs using power chords & that isn't my problem, i want to know some scales & things to help me with writing lead parts. i don't know a whole lot of theory & just need to know what i should learn to improve my writing.

i'm into alternative/punk-pop/grunge styles if that helps, bands like 3 days grace, red jumpsuit,nirvana, Sum 41 e.t.c

any help is greatly appreciated


(again sorry if this is in the wrong place lol)