Code License on this 6502 Tutorial

[SweetPotato22]

Is it okay to copy and paste a few things (only as needed) from here for my own projects?
I'll credit skilldrick of course if they let me, I am always grateful for this kind of thing (I always try to credit people regardless but I know that people sometimes don't want you using their stuff)

If it's not okay that's fine, I can still learn a lot from this awesome tutorial. I know that lots of people copy from other people's code but I feel weird not asking first. Cheers