Name the symptom first
Troubleshooting is easier when the symptom is specific. Stringing, elephant's foot, layer shifts, under-extrusion, and warping usually point to different causes.
Take one clear photo, note the filament, and write down the last setting changed before making another adjustment.
Change one variable
Temperature, cooling, speed, flow, retraction, and bed adhesion can interact. Changing several at once makes it hard to know what fixed the print.
Use calibration models and short test prints when possible so each adjustment is quick and measurable.
Keep a profile history
A simple record of known-good profiles, material batches, and printer maintenance can prevent the same problem from being solved twice.