Chris & Trish Meyer’s series of tips, tricks, gotchas, factoids, and shortcuts continues with on layers with CMG Hidden Gems: Chapter 7 – Trimming Layers. AdobeAE added supporting AE Help links for trimming and slip-editing layers, splitting layers, Sequence Layers keyframe assistant.
For similar recent efforts, see After Effects Leftovers: 40 tips better the next day, A few quick tips for After Effects, and Keyboard shortcuts you (maybe) don’t use.