Some professionals find saving boards as a template to be very helpful.
For example, If you have an intro board you typically use with new clients that includes a project brief, client and contractors' contact information, a checklist to get going, etc. then why not save time by saving a board as a template, complete with the groups you typically begin with, and then launching that template any time needed in the future? The template serves as simply a starting place and the new board can be modified from there.
To save boards as templates:
The next time you go to launch a new board, the template option will be there.