What is a MOODLE PLUGIN? Where can I find them and which ones are the best?

An introduction to Moodle plugins, what they are, where to find them and the most popular plugins of 2022. Plus a bonus instruction on how to install a plugin for Administrators.
►► NEW COURSE - How to use Moodle 4.0 (7+ hours of video training) ricoshae.com.au/udemyref
►► Useful links
Disclosure: Some of the links below go to my websites and some are affiliate links where I may earn a small commission if you make a purchase at no additional cost to you. As an Amazon Associate I earn from qualifying purchases.
Favourite Moodle themes
Edwiser REMUI - ricoshae.com.au/edwiser-239i
Adaptable - moodle.org/plugins/theme_adap...
Moove - moodle.org/plugins/theme_moove
Plugins
Edwiser - Rapid Grader- ricoshae.com.au/kd8h
Design software
Affinity Designer 2 - affinity.serif.com/en-us/desi...
Affinity Photo 2 - affinity.serif.com/en-us/photo/
Screen capture software
Screen flow by Telestream - ricoshae.com.au/i7m4
Most used online services
Canva - Design application - ricoshae.com.au/x6fa
Free pix - Photos and vector images - ricoshae.com.au/3ro0
Tech that I use
Laptop - MacBook pro - ricoshae.com.au/a-esth
Monitor - Dell U2720Q UltraSharp USB-C 27 Inch 4K UHD (3840x2160) Monitor - ricoshae.com.au/a-ccud
Microphone - Rode NT USB - ricoshae.com.au/a-adkf
Microphone - Shure MV7X XLR - ricoshae.com.au/a-bxcg
Audio interface - Claret 8 Pre - ricoshae.com.au/a-58d7
Camera - Sony a33600 - ricoshae.com.au/a-iaag
Programming tools
Sublime Text - ricoshae.com.au/b8m3
Github - ricoshae.com.au/2oe5