In fact, you can learn all of them. If you have the basics of guitar, it proves that you have learned it before, and you can continue to learn. After all, learning one thing is not easy. There is no need to worry about learning another instrument. , completely abandoning the guitar as an instrument, so you can play both instruments at the same time. Of course, it also depends on your own interests and hobbies. If you particularly like one thing, you can focus on learning one, and you can practice the other one in your free time.