There are many tutorials on compositing and special VFX. One of the biggest concerns for Blender and other types of program users is merging or interfacing the a character created in one application with a scene or character created in another application. This is where compositing comes in.
Special Effects or VFX (Visual Special Effects)
As for a sample collection, here is a VFX Pinterest page that has started collecting VFX vids.
You can even get your own Pinterest acct. – its Free, and collect your own tutorials or examples.