illustration 1: after effects workshop 3

right click on the keyframe > toggle hold keyframe > keyframe is held in position until next keyframe and then jumps into position

for example > the raindrop goes back to the cloud without going vertical through the sky

making something flash > toggle hold keyframe > opacity from 0% to 100% > instead of fading in and out > now it flashes

duplicate layer > cmd D

to move duplicated key frames > click position to highlight all key frames > now you can change the position

to group layers > parenting feature > make the other layers all parent to one layer