Check: battery, tires, brakes, fluid levels (washer fluid, oil, coolant, brake fluid, power steering, etc), fuel filters & injectors, belts and hoses, spark plugs, alternator, and the lubrication of wheel bearings, ball joints, etc. Always be sure to follow the maintenance schedule as listed in your car manual.
A TDC Auto Repair Technician will gladly help you understand this list and also help you maintain your vehicle.