Tah 101 provides an introduction to Tah, an Arduino-compatible microcontroller that can be programmed and controlled wirelessly via Bluetooth. It details Tah's hardware which includes an ATmega32U4 microcontroller with 32KB flash and 2.5KB SRAM, a Bluetooth 4.0 module, 6 analog and 12 digital I/O pins, and SPI and I2C peripherals. The document also explains how to program Tah using the Arduino IDE and Tah library, and introduces the ArdSCL protocol for wireless communication. Finally, it lists some example starter projects for Tah like blinking an LED, detecting motion, playing sounds, and controlling RGB lights.