Links

Blend Modes Tutorial

https://www.youtube.com/watch?v=mibCkK1nDpI
https://www.youtube.com/watch?v=mibCkK1nDpI
https://www.youtube.com/watch?v=diJzT-sHizg

Tutorials for Masking

http://tv.adobe.com/watch/understanding-adobe-photoshop-cs6/quick-mask-mode/
http://tv.adobe.com/watch/understanding-adobe-photoshop-cs6/refine-edge-command/
http://tv.adobe.com/watch/understanding-adobe-photoshop-cs6/quick-selection-tool/
http://tv.adobe.com/watch/understanding-adobe-photoshop-cs6/refine-edge-command-for-fine-edges/
http://tv.adobe.com/watch/learn-photoshop-cc/working-with-refine-edge/

Green Screen

Green Screen Keylight Tutorial 

Multi-plane Links

Walt Disney explains multi-plane: https://www.youtube.com/watch?v=YdHTlUGN1zw
After Effects Multi-plane Example: https://www.youtube.com/watch?v=_hKLVYHfvUc

Various Examples: https://www.youtube.com/watch?v=0gx36KNwvGQ

Tutorials for Motion Tracking

http://www.youtube.com/watch?v=yWojp9MFMCY

http://www.youtube.com/watch?v=8pjXZkmpIzU

http://www.videocopilot.net/basic/

http://www.videocopilot.net/tutorial/depth_compositing/

http://ae.tutsplus.com/articles/roundup/26-tracking-and-matchmoving-tutorials/