Good news, electric cars require far less maintenance than regular combustion vehicles. This is due to the fact that electric vehicles have less mechanical components, many of which which would normally require periodic service.
To give you a rough idea what's involved, here is the maintenance schedule for a 2019 Chevrolet Bolt EV:
Monthly (self inspection)
Measure your tire pressure and examine tires for wear. Inspect/refill windshield washer fluid.
Every 7,500 miles
Look for any fluid leaks. Tire rotation. Brake inspection. Inspect cabin heater, battery coolant level, and the power inverter, accessory power, and charger modules. Check suspension, chassis, steering, and airbags.
Twice per year
Wash the vehicle underbody with water.
Every 15k miles
Buy new windshield wipers.
Every 36k miles
Replace cabin air filter.
Every 75k miles
Replace vehicle suspension.
Every 5 years
Change brake fluid. Drain/refill coolant circuits
Every 7 years
Replace AC desiccant.
Last, but not least, your vehicle's battery pack is one of its most expensive replacements. Electric car batteries degrade over time and slowly lose their ability to fully charge. If you notice your mileage per charge is a fraction of what it once was, it might be time to replace the battery.