I am thinking of buying a mini keyboard with 37 keys. It is small and portable so I can carry it around when I travel. One thing I'm not so sure is how to play with both hand with there not being enough keys. I usually play with my keyboard with 61 keys. When I watch people on YouTube that play 37 keys they play flawlessly but I wonder how they are adjusting to the missing keys. For example, if middle C is literally the middle C on keyboard then there are not enough keys for the bass clef.
Can someone please teach me how to effectively play with a mini keyboard?