Yamaha P-45B is a great portable digital piano for beginners. Very good quality and it's affordable. One of the best things about it is that unlike some keyboards, the keys are fully weighted. This is an important factor for piano learners as it gets closer to playing with an acoustic piano.

The model I got has got old and is mostly out of stock. Here's a newer version. They're basically the same.

- Digital Piano: https://amzn.to/4b7vOvI
- Stand: https://amzn.to/3SsXq74
- Bench: https://amzn.to/45YDb5l