TLDR: Yes. Look at it this way, the market has decided long ago that acoustic pianos have 88 keys; therefore digital pianos have 88 keys. Just buy an 88 key piano, and you will be all set. Yes, music from the baroque and early classical eras did not use all 88 keys because harpsichords and early pianofortes had only 4-5 octaves of range. But there is no sense buying a keyboard of 61 keys as your main learning instrument and then finding out later your keyboard does not have the notes needed to play certain pieces. Buy 88 keys. Once you are playing, there are specific reasons people buy 25, 36, 48, 61 and 76 key keyboards. Many are used as MIDI controllers, Arranger Workstations, or for software instruments of a limited pitch range, or used as stage instruments in pop bands. Non-88 key keyboards are specific solutions for specific demands. You can buy one of them later, and you likely will. But buy the fully weighted 88 key versions first.