I am new to Zbrush and need advice which site is best for learning Zbrush online from novice to expert.
If you are just starting out save your money and check out the zbrush classroom free on the pixologic site. Once you get more advance gnomon workshop, zbrush workshops, cgma, there are lots of paid resources that are good but the small starter vids on the pixo site will get you comfortable first
Check out Michael Pavlovich’s Youtube site. He has tons of free videos available: https://www.youtube.com/user/Pavlovich2005, and if you feel like spending a little money, visit his Gumroad page.
Also, check out Zbrush Live: http://pixologic.com/zbrushlive/