Datum Creation Technique Reference?

i'm curious if anyone has created or knows of a reference about the different ways to make datums?

example: offset angled datum planes (disclaimer: i don't know if this is the best way, just giving an example)

1. click datum plane, leave window open
2. click axis datum
   1. create offset axis to be used for plane rotation
3. Accept creation of axis
4. the axis should be preselected for the plane creation
5. Select a reference datum
6. enter rotation angle
7. accept creation of plane

i had started a notebook as I came across creative ones but i lost it.