How to get my hair less frizzy and tangly?

See, after I take a shower, I have untangled, smooth hair! Until it dries. For some reason, as it dries, it tangles and frizzes! Why!? It bugs me and no matter what I do it still does that. I can't go but a bunch more hair products for my hair so hopefully their is some simple tricks I can do at no cost. Please help! Thanks so much!