Below is the list of online Moodle Instructor guides resourses:
Moodle official userguide: https://docs.moodle.org/30/en/Main_page
The document is very detailed and describe from a technical perspective to show how to click step by step. They also offer online course for about 4 weeks
HKU Moodle userguide: http://moodle-support.hku.hk/
Simple and supplement documents with videos.
*CUHK Moodle userguide: http://moodle.scs.cuhk.edu.hk/mod/page/view.php?id=41170
Comprehensive (Including Veriguide) and guided by most frequetly answered questions from instructors, which is more useful for me to solve instructors' questions.
There're also Some paid courses but I only reviewed the outline. I recommend learning from CUHK Moodle userguide as it answers most questions instructors will ask, which may requires a very detailed setting or combination of 2 settings. It will be more attractive to teachers than a long document of how to create an activity which means nothing to a teacher without much time to learn how to use MOODLE.