Acoustic guitar. Electric guitar. Classical guitar.
Guitars have been around for centuries but have been most popular for about the last 100 years. There are so many styles and genres and many amazing musicians and composers.
Getting started can be fairly easy and before long you’ll be able to play a few basic pieces. How far you progress as a guitarist depends on how much time you can devote to playing.
Instruments are not overly expensive and they’re very portable!