1. Raspberry Pi main website:
https://www.raspberrypi.org/

2. Raspberry Pi “Wiki” – now becoming dated, but a wealth of tech information, if that’s what you want.
http://elinux.org/RPi_Hub

3. Newer “official” documentation.
https://www.raspberrypi.org/documentation/

4. Linux Command Line on Raspberry Pi:
https://raspberrypi.org/magpi-issues/Essentials_Bash_v1.pdf

5. GPIOZERO. The software API for accessing GPIO pins.

• https://media.readthedocs.org/pdf/gpiozero/latest/gpiozero.pdf
• https://www.raspberrypi.org/magpi/issues/essentials-gpio-zero-v1/

6. Scratch.

• https://raspberrypi.org/magpi-issues/Essentials_Scratch_v1.pdf
• And for the best available GPIO control in Scratch:
  https://www.raspberrypi.org/documentation/usage/scratch/gpio/README.md

7. Javascript.

• http://www.javascriptkit.com/jsref/index.shtml
• https://docs.microsoft.com/en-us/scripting/javascript/javascript-fundamentals
• https://www.w3schools.com/js/default.asp

8. Nodejs

Tutorial: http://nodeguide.com/beginner.html

9. Arduino

• Language and libraries:  https://www.arduino.cc/en/Reference
• Tutorials: https://www.arduino.cc/en/Tutorial
• C language or C++? Don’t spend too much time, but myriad tutorials on internet if you search.

10. ESP8266 as an arduino

• https://arduino-esp8266.readthedocs.io

11. Lua language and ESP8266

• http://tylerneylon.com/a/learn-lua/      “Learn Lua in 15 minutes” Just first few “pages”. Eg if you see anything like “Meta…” you have gone too far!
• nodemcu.readthedocs.io/     All functions for ESP8266 . Use extensive index at left sidebar.

 

 

As we cover new areas or coding languages,
the definitive best internet references will be added here.

Python
C/C++
SonicPi
Forth
Lua
etc