DJI has a guide to properly maintaining your drone over here:

That’s a great place to start. The big thing is to have a strong pre- and post-flight checklist. Most of the maintenance and care and inspecting you’d be doing are right before and right after each flight.

When it comes to the lifetime of your batteries, motors, and all other components, here are a few considerations and best practices:

• Every 10-20 battery cycles (or every 3 months if you’re not flying that often), discharge the battery and then fully recharge it
• Every 200 flights, change the propellers
• Brushless motors are extremely low maintenance devices. They should last a very long time. If the bearings fail, you’ll get a ‘Motor Obstructed’ warning.