The piano is such a popular instrument that there are many choices for every budget. As you pay more money you get higher build quality and more features.
Most people start with a Digital Keyboard of some sort. Either a Digital Piano or a Synthesizer.
If you intend on learning traditional Piano, it recommended that you get something with 88 Keys that has a “Weighted Action”
The Weighted-Action makes the keys feel heavy, more like a real Piano.
Many Keyboards offer “Hammer Action” or “Semi Weighted Action”. If you rarely plan on playing a real Piano and you like the feel of a particular keyboard you should go with what feels comfortable. Different brands have a different feel in the Keys.
Digital Pianos all use microchips to produce their sound. Manufacturers put their newest and best technology’s in their flagship models.
A $200 Yamaha Digital Piano set on “GRAND PIANO” will sound less good than a $2000 Yamaha Digital Piano set on “GRAND PIANO”. The more expensive model has a better processor allowing more depth and character in the sound.
USB keyboards do not have any sounds built in. USB Keyboards are used to control software on a computer. Garageband is a common home recording software, you can access thousands of sounds to play and record with your USB Keyboard.