Here is a growing collection of tips, tricks, and techniques for the Arduino.
Arduino UNO Pinout Complete Guide [With Diagram]
REES52 UNO R3 2.8 Inch TFT Touch Screen with SD Card Socket for
Arduino not working? Troubleshoot Tips and Tricks to make It Work
Programming Atmega168/328P using Arduino Uno - Microcontrollers
Arduino - Technical References, Programming, Tips & Tricks, And
Arduino With Python: How to Get Started – Real Python
Tips and Tricks for Programming Arduino
Arduino for Everyone: From Kids to Inventors by Maria Emma Plaza
ArduinoISP, Arduino Tips, Tricks, and Techniques
A DIY Starting Guide with the Arduino 101