The Vermont Secretary of State’s website has concise descriptions of various local government offices: Local Office Descriptions.
I found this one amusing:
Selectboard Members (elected). General supervision and control over town; enacts ordinances, regulations, and policies for town; oversees town property and personnel; prepares, presents and manages budget; and oversees roads, including laying out, discontinuing, and reclassifying roads. Sits as local board of health, liquor control commission, and sewer commission. Should know the town well, be able to understand all sides of complex issues, and have very thick skin.