Hello! These are some nice references for the UBX course I'll be giving:

General help and info pages about UBX

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Userboxes that already exist

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One 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.