All depends what part of the country your fishing in? I live in SOFLA. Traditionally flats in the am and move out deeper as the afternoon arrives. However here not many lakes have contours. Fish use the grass lines as contours. Some lakes, ponds, or canals may only be 6-8 ft at the deepest point. Covering water early wether it be a frog, buzz bait, swim jig, swim bait, crank etc.. ESP in the summer beat up the bank early. As it warms up start to focus on shade lines. Finding current is also key. Usually mouth openings into a main channel or lake where fish can transition to deep water quickly works. If the bite really slows find matted vegetation. Pitch n flip. Use a heavy jig. Work the bottom.
