Low-cost learning and inventing: Amazon Fire tablet, Pi Zero W.
This example creates a low-cost, portable, learning and physical computing platform. Amazon tablet (as low as $29.99 when on sale) provides display, keyboard and mouse functions, connected to a WiFi access point installed on the R-Pi. Remote control is provided via VNC software (VNC server on R-Pi; VNC client on tablet). Shown above is Scratch drag 'n' drop programming application controlling LEDs in a stop-light sequence.
Tablet Frame Kit for Raspberry Pi and Arduino, Model AZ8, by Novel Design Lab
Adapter for Amazon Fire 7" tablet, by Novel Design Lab
Amazon Fire 7" tablet (2019)
Raspberry Pi Zero W
Power supply for R-Pi: use charger from Amazon tablet
3-Ring Mini Binder, Logo, Kraft, by Novel Design Lab
Miscellaneous items: microSD card, solderless breadbaord (82mm x 55mm x 8.5mm), LEDs, resistors, wires
Installed on Raspberry Pi:
Raspbian with desktop and recommended software (includes Scratch and other apps) https://www.raspberrypi.org/downloads/raspbian/
WiFi access point installed (per Raspberry Pi Foundation instructions): https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md
Some settings: enable VNC server (Raspberry Pi Preferences); enable VNC password (VNC Server options); set screen size to best-fit tablet (Raspberry Pi preferences)
Installed on tablet:
Option 1: Remote Desktop Manager (Amazon Appstore)
Option 2: install Google Play store: https://www.laptopmag.com/articles/get-google-play-on-fire-tablet then install RealVNC Viewer (Google Play Store)