these days a decent guitar needn't cost a lot. and learning three chords isn't a major problem. with those three chords you can accompany a lot of songs. and you can take a guitar to a party if you chose an acoustic not an electric! how many people pull out a piano at a party and everyone sings along?

point i'm trying to make is that with a guitar you have a quick and easy entry to the world of music by singing and playing lots of songs you already know.

so once you know three chords you learn what three chords you need to learn to play in a different key. then you learn the relative minor chords.

quickly you get the idea of keys, scales, chord structures and harmony and how they work together in a fun way.

i know pianists who play well and read music but just don't know how things relate to each other. a local organist plays every week at church but didn't know how a major chord was built up.

once you know how chords work you're ready to start working BIAB. good luck!