What instruments should someone learn in their life?

-I already know how to play piano and am learning guitar now. Want to also pick up other instruments later down the road but don't know which. What instruments do you think can be taught by yourself well and what instruments do you play?Violin is one you could learn yourself, aswell as flute. Drums are pretty easy too. You just need a beat or rhythm and play it etc. For flute and violin, you can find online lessons with videos and sheets :)Piano and guitar for sure. Violin would be nice too:). Drums!