A hybrid bike would be a great place to start. Your first bike is rarely your last. As you ride it, you’ll gradually learn what you like and don’t like about it. Some things can be replaced or upgraded. Eventually you’ll have a better idea of what to get for your second bike. If you’re buying used, make sure there are no signs of rust, the brakes and shifters work as expected, there are no squeaky or metal-on-metal sounds, and the bike is appropriately sized for you, and you should be good to go.
Also, you don’t have to do all the maintenance yourself. Bike service is usually pretty cheap. Some things I do myself, but when it requires special tools, the bike shop makes more sense.
When people refer to metal balls as ball bearings. A ball bearing is an assembly of outer ring, inner ring, balls, and a cage/retainer. I worked in bearing manufacture for years and they’re just referred to as balls. To be more specific, it would be a bearing ball, not a ball bearing.