The beauty of Adobe After Effects is that it's approachable for simple tasks
and at the same time has a feature set capable of producing complex film
quality effects. In the olden days we had to walk miles through snow to
pay for After Effects tutorials, if there were any, but now
there's tons of worthy free stuff. The biggest gotcha with this material
for beginners might be the new previewing features expected in the
2015 version of After Effects CC.
General sage advice is to start at the
beginning, but knowing Photoshop and Premiere or Final Cut gives you a
big head start. And remembering to "divide & conquer," that is subdividing tasks into doable chunks, will keep progress moving.
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Read the article at Pro Video Coalition,
Start At The Beginning In After Effects.