Hello, I'm new to speedrunning and my friend said I should try doing NMG. If anyone has videos or guides for skips and other things that I would need to know for an NMG run I would very much appreciate a link.

First thing I'd recommend is joining the Discord (link should be on the left sidebar). There's tons of resources there, and if you're still struggling a bit then you can ask for help. If there's something specific you want help with people are always down to help, but if it's just getting started, I'd recommend just doing a run or two on your own. If you've watched a run or two previously and want to incorporate some strats, go for it, but otherwise just get a feel for the game a bit so that you can get a better understanding of "what" is being skipped, or "why" we are skipping something in certain ways.

Lastly good luck and have fun, of course. :P