Is the Lenovo Tab M9 good for kids?

Yes, it suits kids well: it is small, light and inexpensive, with expandable storage for offline videos. Parental controls come through Google Family Link, and a case is worth adding.

Can it handle games and heavy apps?

Only light games and simple apps run smoothly. The chip and 4GB of RAM struggle with demanding 3D games or many apps open at once.

Does it support a stylus or keyboard?

No. The Tab M9 has no active stylus support and no pogo-pin keyboard accessory, so typing is on screen or through a Bluetooth keyboard.

How much storage is usable, and can it be expanded?

The 32GB model leaves well under that free after Android and preinstalled apps. A microSD card adds room for photos, downloads and offline video.

Does it have cellular data?

This is the Wi-Fi model, so it needs a Wi-Fi network or a phone hotspot. A separate LTE variant exists but is a different model.

Is it worth it over a full-HD budget tablet?

If screen sharpness matters, a full-HD rival is the better pick. If you want a cheap, sturdy tablet for video, reading and kids, the Tab M9 is a sensible choice.