The board is the best board to get started with electronics and coding. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header and a reset button.
Tinker Kit Circuit Guide - SparkFun Learn
Btoociya UNO R3 Board ATmega328P with CH340G Chip Compatible with Arduino UNO R3 Mega 2560 Nano Robot for Arduino IDE AVR MCU Learner K53,with Straight Pin Header and USB Cable
UNO R3 ATMega328P CH340 Development Board With Cable COM46, R27 - Faranux Electronics
Tinker Kit Circuit Guide - SparkFun Learn
Prototype Shield with Breadboard for Arduino UNO R3 Board (with 2 SMD LEDs, reset and switch buttons!). Acrylic Case for Arduino UNO R3 Board. The
CH340 ATmega 328P R3 Board Compatible with Arduino UNO IDE + Case + Shield
Nano V3.0, Nano Board ATmega328P 5V 16M Micro-Controller Board Compatible with Arduino IDE (Nano x 3 with USB Cable) : Electronics
Iduino Uno - compatible with Arduino + USB wire Botland - Robotic Shop
Arduino CNC Shield Protoneer V3.0 - 100% GRBL Compatible – Server On The Move
OSOYOO 3pcs Nano Atmega328P Module CH340 5V/16M USB-C Micro-Controller Board for Arduino Nano V3.0 : Electronics
3x NEW Compatible with Arduino UNO R3 IDE, ATmega 328P CH340 R3 Board US Seller
Arduino UNO R4 — Arduino Official Store
August, 2016