Pre-Comping

One of the techniques that was suggested to me was pre-comping which I found very useful and used it a lot through out my animation it's a really good way of creating walking or driving animations for example and then adding them to the main composition.  

Also the time-stretch and remapping options helps to speed up a pre comp of loop it for example I used both of these options on my walking pre-comp to loop it so the guy keeps walking but a lot time-stretch to speed him up so he goes with the speed of the animation.