The artist is well known for his use of light/shadow in his works and is probably going to be the first bullet on any list. Also known for expensive pigments, an unknown style/methods , and being sloppy but extremely detailed depending on your vantage / distance. Zooming in on this one will highlight that

I can recommend The Story of Art: https://en.wikipedia.org/wiki/The_Story_of_Art

John Berger's Ways of Seeing, I think it's all on youtube. There's also a book adaptation though I've not read that

I very recently created an app that helps people learn art history.

https://apps.apple.com/gb/app/for-arts-sake/id6744744230

It’s a first version, and there’s a lot more content and features to come, but it’s actually already taught me so much making it!

Thank you too from me. Ideally a youtube channel or channels