Apps like Arduino Handbook

Here are some great alternatives to Arduino Handbook by Oleksandr Dovhaliuk :
Arduino Basics
Arduino Basics
★4.4
Arduino Library Reference
Arduino Library Reference
★4.1
Arduino Tutorials - Examples
Arduino Tutorials - Examples
★4.0
Arduino Starter Kit
Arduino Starter Kit
★4.2
Arduino Bluetooth Robot Car -
Arduino Bluetooth Robot Car -
★4.1
ArduinoDroid - Arduino/ESP8266
ArduinoDroid - Arduino/ESP8266
★3.5
ArduController
ArduController
★4.5
Arduino Projects
Arduino Projects
★3.6
pfodDesigner V3 for pfodApp
pfodDesigner V3 for pfodApp
★3.4
Libraries for developers
Libraries for developers
★4.4
Source Codes - Learn Android
Source Codes - Learn Android
★4.6
Learn Android App Development
Learn Android App Development
★4.3
Android Development Course
Android Development Course
★4.6
Linux Man Pages Reference
Linux Man Pages Reference
★4.6
Learn Android Studio Coding
Learn Android Studio Coding
★3.7
Learn Android App Development:
Learn Android App Development:
★4.3