The best thing I ever did was take a instructional trip. It was 8 hours with a pro fisherman. The first 4 were us sitting in a restaurant and him literally telling me the how he breaks down a lake for tournaments, what bass do based on water temperature, and what minimal amounts of baits he recommends I need for each season (water temp). We then went to the lake and he said ok, what would you do today based on what I just taught you. It was 3pm, July, blue bird sky, and 100 degrees, on a lake I had no knowledge of, and we wore them out.
Ex: rule - big fish ambush
winter (~40deg water) moving baits - A-rig, jerkbait
winter slow baits - drop shot, Ned
Patterning in winter- cut off all dirty water (feed more by sight in colder water), cut off all south facing coves (wind blown and colder). Now look for north coves that big tournaments go out of and start there. Hit the best looking cover in the back 3rd, middle 3rd, and front 3rd or the cove. 10 minutes or so per spot. If you can establish a pattern, go fish as many north facing coves following that pattern, that you can for the tournament.
That’s a very short snippet of a TON of info I got that day. Just one pro’s, who is pretty successful, simplified way of breaking down a lake. It helped me eliminate water. It helped me simplify my tackle.
Once you’re comfortable you can start expanding out on tackle and such based off the same principles.
Ill never be a pro or a hammer. But I do cash checks in local clubs, beat my buddies often, and catch fish.