Many individuals routinely ask about investing in schooling from formal institutions or online resources. There are plenty online solutions to learn and gain insight on many areas useful for today’s CG artist regardless of specialty. Every great artist I have met has reminded me that you are never “done” you are always learning and progressing, this mindset will help guarantee your success.
Art history courses from Khan Academy
Programming courses from Coursera (various universities providing this)
Music, Film and audio composition courses from Coursera
Video Copilot-visual effects and primarily covers Adobe After Effects and compositing
Creative Cow- thousands of useful tutorials and information
Red Giant - many tutorial videos
Matt Kohr’s training/Ctrl+Paint-very high quality training for free in traditional and digital drawing/painting
Animation Master Class- couple high quality animation training videos
Animation Methods- extensive animation/texturing/modeling video tutorials
FZD School of Design- Numerous digital drawing videos
Indy Mogul-low budget practical effects videos tutorials
Learn Maya-extensive Maya video tutorials
Maya Learning-even more Maya video tutorials
mstarktv- high quality rendering/compositing tutorials with Max\Fume\Mental Ray
Zbro- Zbrush video tutorials
Film Riot-VFX and practical effects video tutorials/webshow
Molecular Movies-Medical animation/modeling
These are all resources I have used or routinely keep up with, if you have more please share and I will add them.