FWIW, I've never had a bike fit. I just started riding and reading up here and there.
The keys that I have found are...
Seat height placement (i.e. forward or back) and angle
Cleat angle.

IIRC, they used to call Lance Armstrong Mister Millimeter because he would make changes very incrementally. Whenever I adjust my saddle height, I do it in 1 or 2 mm increments. If I don't feel like I am getting good extension (like sitting in a kitchen chair lifting your feet up and down) then I will take the seat post up a couple of millimeters and go for a ride. Eventually I get to the point where I can just feel that I am overextending my legs and I dial it back.

I once bought some 0 degree cleats. I used them for a couple of weeks and they killed my knees. Some people have a nice straight pedaling gait where the angle of their feet with regards to the pedal changes very little. I am not in that group so I like cleats with more angular motion. 6 degree typically.

Although a standard fitting will suit most people, not all people are built the same.

Measure your current fitting very accurately and don't be afraid to tweak it a bit here and there. Eventually you will find your comfort spots.