Internet resources

I assume that you have sites and blogs that you use. like my bookshelf these are sites that I use regularly.  If you haven't discovered RSS readers, a blog reader, I like Feedly https://feedly.com/i/welcome

On color and palettes, in no certain order
http://www.paintmaking.com/traditional_palette.htm
http://colourlex.com/
A phenomenal achievement  http://www.artiscreation.com/Color%20of%20Art.html
The Munsell system https://www.rit.edu/cos/colorscience/rc_faq_all.php
A wonderful idea http://www.colorhunter.com/

For your aesthetic
 http://www.artbabble.org/
Bert Christianson http://bertc.com/index.html
https://commons.m.wikimedia.org/wiki/Main_Page
https://www.google.com/culturalinstitute/project/art-project
http://www.artic.edu/mobilefront

On technique
The mind behind Dinotopia http://gurneyjourney.blogspot.com/2015/03/five-tips-from-carl-evers.html
A master of egg tempera http://www.kooschadler.com/index.htm
A phenomenal achievement by this artist http://handprint.com/HP/WCL/water.html

Blogs I read daily
Contemporary Art daily
Muddy colors
A plein air painters blog
A/art
Arrested motion
Street Art utopia
Urban sketchers
Watercolors
Watercolors and words