The Little Book of Boards provides a concise and easy-to-read overview of the responsibilities of a board member. It provides an excellent overview of the fiduciary responsibilities of the board and then the further responsibilities of someone who takes a leadership position. Some books were too detailed but this one provided enough context for someone new to a board position.
Some notes about disagreement during board meetings
Groups are smarter than individuals. Diversity within a group makes it even stronger. For example, a board with all college graduates is not as smart