Performing car maintenance tasks on your own typically depends on your skill level, the availability of tools and equipment, and your familiarity with automotive systems. Here are some relatively simple and common car maintenance tasks that you can do on your own:

1. Replace the air filter: The air filter is usually located in the engine compartment and requires removing a few screws to replace the filter element.

2. Change the oil filter and oil: Regularly changing the oil and oil filter is crucial for maintaining engine health. Lift the vehicle, remove the oil pan, and replace the oil filter.

3. Replace spark plugs: Periodic replacement of spark plugs can improve fuel efficiency and engine performance. Use a spark plug wrench to remove the old plugs and install new ones.

4. Replace brake pads: When brake pads wear down, they need replacement. Lift the vehicle with a jack, remove the tire, and replace the worn brake pads.

5. Replace the battery: When the vehicle battery reaches the end of its life, you can replace it yourself. Ensure to disconnect the negative terminal to avoid electrical shock.

6. Replace light bulbs: When bulbs burn out, you can replace them yourself. Depending on the model and bulb type, you may need to open the hood or light cover.

7. Inspect and replace windshield wipers: Worn wiper blades can affect visibility. Periodically check and replace windshield wiper blades for optimal driving visibility.

8. Inspect and rotate tires: Regularly check tire pressure, wear, and tread. If wear is uneven, you can rotate the tires yourself.

9. Check and replace coolant: Regularly check the coolant level and ensure the cooling system uses the appropriate antifreeze.

10. Replace cabin air filter: Regularly replacing the cabin air filter helps keep the air inside the vehicle fresh and maintains the performance of the air conditioning system.

Note that for more complex issues such as engine malfunctions, transmission problems, or brake system failures, it's best to have a professional technician inspect and repair the vehicle. Always refer to the vehicle manual and manufacturer's recommendations, ensuring you understand the maintenance needs and suggestions for your specific vehicle.