Hello! These are some nice references for the UBX course I'll be giving:
General help and info pages about UBX
editUserboxes that already exist
editOne example of a Userbox is this one about white-tailed deer.
You can transclude a Userbox like this:
{{User:WaddlesJP13/Userbox/White-tailed deer}}
which will look like this:
 | This user likes white-tailed deer. |