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/