Here is a collection of App Inventor 2 tips which I find very helpful. More will be added when I come across them in the future.
General / Beginner
Android Development for Beginners
https://www.youtube.com/watch?v=ugWu3gyte4I
AI2 Text Blocks
http://appinventor.mit.edu/explore/ai2/support/blocks/text.html
AI2 http://appinventor.mit.edu/explore/content/math-blocks.htmlMath Blocks
Example 1. How do you start and pause a sound file when the user clicks a button?
http://www.appinventor.org/content/howDoYou/Conditionals/startStop
Database
Using TinyDB to store sound recording - App Inventor 2
https://www.youtube.com/watch?v=95CZHshnsMg
Tutorial : MIT App Inventor + Firebase
https://rominirani.com/tutorial-mit-app-inventor-firebase-4be95051c325#.36b57nrmt
Proximity Sensor
App Inventor 2 Tutorial - Proximity sensor basic
https://www.youtube.com/watch?v=TsmJNo5W4jU
MIT App Inventor 2 ITA# Tutorial 61 Proximity Sensor
https://www.youtube.com/watch?v=dN69ePOVlsA
Bluetooth
Part 1: Basic Bluetooth communications using App Inventor
http://appinventor.pevest.com/?p=520
Android Develop - Settings
https://developer.android.com/reference/android/provider/Settings.html#ACTION_BLUETOOTH_SETTINGS
App Inventor 2 Tutorial-Arduino Bluetooth Control
https://www.youtube.com/watch?v=pR2rTRDZ_-Y
Turning a LED on and off with an Arduino, a HC-06 and Android
http://www.martyncurrey.com/turning-a-led-on-and-off-with-an-arduino-a-hc-06-and-android/
Android MIT App Inventor – Auto Connect To Bluetooth
http://www.martyncurrey.com/android-mit-app-inventor-auto-connect-to-bluetooth/
Bluetooth car with App Inventor 2.
https://www.youtube.com/watch?v=z0UQAyDZeBo
Простая Bluetooth машинка на Arduino
https://geektimes.ru/post/255442/
Alert Box / Message Box
Display “Warning” and “Alert” box messages in App Inventor apps
http://appinventor.pevest.com/?p=81
Clock / Timer
App Inventor 2 tutorial - simple clock timer with pause, reset, save, load function
https://www.youtube.com/watch?v=tIKowBYIAG0
Timed Activity: How do you repeat an action, pausing between each iteration?
http://www.appinventor.org/content/howDoYou/timedActivity/sound
Sound Effect
App Inventor: How to Add Sound Effects
https://www.youtube.com/watch?v=YkDfwiZoQ-w
Sound Effect Resource - Win98sounds
http://www.mscs.mu.edu/~mikes/174/demos/Win98sounds/
Misc.
How to overcome the App Inventor project limit of 10 MB
http://puravidaapps.com/filebyfile.php
Howto: Using Google Drive to access Files (Images) from AI2
https://groups.google.com/forum/#!msg/mitappinventortest/wGKeG41A1mI/vD4YmxYLrx0J
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