I am often asked for about additional resources for learning about Colour and Colour Grading. These are a few of the sources I would recommend.
TUTORIALS
My regularly updated conform guide
https://www.benpacker.xyz/conform
Mixing Light: A good amount of tutorials for all grading software
https://mixinglight.com
Cullen Kelly: Good explanations of concepts behind grading, not “tricks”
https://youtube.com/c/CullenKelly
BOOKS
Color Correction Handbook: Professional Techniques for Video and Cinema - Alexis Van Hurkman
https://www.amazon.de/-/en/Alexis-Van-Hurkman/dp/0321929667
Digital Color Correction - Steve Hullfish
https://www.amazon.de/-/en/Steve-Hullfish/dp/0240809904
SCIENCE
Basics of Eye Science
http://askabiologist.asu.edu/rods-and-cones
Visual Illusions
https://www.ritsumei.ac.jp/~akitaoka/index-e.html
Answers to many colour questions
http://poynton.ca/ColorFAQ.html
An Overview of difference Colour Appearance phenomenon
https://www.handprint.com/HP/WCL/color4.html
NEWSLETTERS
The Tao of Color: Colour Grading specific news and articles
https://taoofcolor.com/newsletter/
Frame.io blog: General Post-Production, but many articles focus on Colour Grading
http://blog.frame.io
FORUMS
Lift Gamma Gain: Community with discussion topics covering colour grading.
https://www.liftgammagain.com/forum/index.php
ACEScentral: A central forum where development discussion about the ACES system takes place.
https://acescentral.com/
PLUGINS
Neat Video 5: Noise Reduction
https://www.neatvideo.com
Filmbox: High Quality Film Emulation plugin
http://videovillage.co/filmbox/
FilmConvert Nitrate: FilmGrain + Film Look
https://www.filmconvert.com
FREE FOOTAGE
https://www.arri.com/en/learn-help/learn-help-camera-system/camera-sample-footage
https://www.red.com/sample-r3d-file
http://sonycine.com/testfootage/