It’s easy to customize the app to familiarize yourself with the ESP32. For example, the writings are done in the vertical direction, which makes the characters very small.
TTGO T-Watch is watch shape ESP32 based development kit. 16 MB flash and 8 MB PSRAM both are top specification. It also built-in a 240x240 IPS LCD, touch screen, micro-SD card port, I2C port, RTC, 3-axis accelerometer and a custom button.
This article provides references on the ESP32 and on the LilyGO TTGO T-Display development board used in my projects. General documentation on ESP32 is provided on the Espressif ESP32 Resources website.