I’m not the only person who’s compiled advice, tools and resources, so here’s the other places I’d recommend checking out!

My collaborator Brandon Barker (LANL, by way of MSU) has most of his past application materials for both graduate and undergraduate fellowships and experiences compiled on his personal website, along with a list of useful undergraduate research opportunities. I used this page a lot when developing my own applications for grad school.

Fellow NC State Physics alum Josh Ott (now at MIT!) has a library on his website with a variety of resources, including successful application materials, slides, and more!