Can anyone recommend me any resources from which I could learn about how stars maintain a stable form, maybe using some thermal and nuclear physics, and maybe fluid dynamics, but not so advanced. Something that an undergrad can read.
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If you don't want something too advanced like you said in your comment I'd recommend "An Introduction to Modern Astrophysics" by Carrol & Ostile. It contains much more than stellar structure, but those parts may be as advanced as you are asking now.