Fine haired wavies!! What’s the best hair care advice you’ve received?

I have fine, wavy hair, and I’ve found that a lot of advice for those two things contradict each other!! Most products advertised for curls and waves are too heavy for my hair, but products for “fine hair” have too much protein for my porosity. And you always hear people say not to wash wavy/curly hair too often, but for fine hair a lot of people say they wash it every day. It all just gets very confusing. So my fellow fine-haired wavies, what is your best advice for caring for your wavy hair? What’s helped you the most?