Pre-landing Mental Preparation Checklist: GUMPS, a simple note.

G - Gas Fuel selector BOTH, Fuel pump ON, Proper fuel pressure, etc.
U - Undercarriage Landing gear down
M - Mixture Fuel mixture RICH
P - Propeller Propeller pitch high (coarse)
S - Seat belts and Switches Seat belts, Lights, Pitot heat, etc.