Learn the guitar
Pick up a guitar, learn a few basic chords, and get used to the strange feeling of making both hands do completely different jobs. Early progress can come quickly: with a handful of open chords and a steady strumming pattern, you can already play simplified versions of hundreds of songs. The harder part is making those changes cleanly, staying in time and building enough finger strength for the instrument to start feeling natural. Learning guitar means developing rhythm, chord shapes, picking, basic music theory and eventually techniques such as barre chords, scales, fingerpicking and improvisation. You do not need to read traditional notation unless you want to; chord diagrams and tablature are enough for most beginners. What matters more is regular practice and playing actual music rather than spending months doing exercises in isolation. Start with an acoustic or electric guitar that feels comfortable to hold, then follow a structured course, teacher or combination of lessons and independent practice. Aim for short, frequent sessions and learn songs you genuinely like as early as possible. Add this to your list and keep going until you can pick up a guitar, play several songs from start to finish and sound like you know what you are doing.