Wiggle is most peoples first After Effects Expression because it's very easy to understand.
Wiggle (25, 1)
Wiggle (Frequency - how often per second, by Amplitude - how many pixels)
In this issue of Cut/daily we're going to look at a couple of examples of using really simple expressions, like wiggle, to achieve some useful aesthetic transformations such as film gate weave and 'animation boil' - which is that wobbly hand-drawn look.
Both of these can make your simple graphics look far more interesting in about 5 combined seconds of typing.
To add an expression to a parameter in After Effects, option click on the parameter to open the expression editor for it and then start typing.