At last everyone - possibly the best ever comprehensive guide to mBot and mBlock 5 - ‘mBot and Me’ - an ‘open-source’ download (free) from:
https://education.makeblock.com/resource/?query=146&page=1 6
This is an in-depth explanation of just about everything you need to know; and it’s totally applicable to mBot Ranger and mBot Ultimate users too.
Feedback appreciated.