The Attribute Adjust nodes provide a variety of ways to adjust the values for whichever attributes you'd like. You can randomize values, adjust them based on proximity to something, and much more. In practice, this can be very useful for a wide range of tasks and will simplify your workflows when changing attribute data.
The parameters for these nodes will change depending on what kind of data type you'd like to alter. For more info on data types, please visit Houdini For the New Artist II.