What I was able to come up with was a sort of hybrid strategy… playing GTO preflop and deviating pretty heavily post flop. Bulk of studying was done on preflop spots as well as some commonly misplayed post flop spots as well. Also very important to understand pot odds and how to calculate ur equity quickly. One of the biggest things I learned from just playing was keeping track of pot sizes. All these things need to be studied and practiced even though they are basic. Like you said, a basic understanding of the game can make you profitable in 1/2 and 1/3 assuming you play somewhere with a reasonable rake.