Scrum Mater
How many Scrum Master have one Development Team?
Skill for Scrum Master?
Every Development Team should have one and only one Scrum Master.
It is ideal to have a 1-to-1 relationship between the Development Team and the Scrum Master, although there are circumstances where a Scrum Master may be asked to serve more than one Development Team.
A Scrum Master should have a solid understanding of Scrum, along with an understanding of team development, how to lead without authority, a servant's heart/attitude, empathy, and patience. That just touches the surface, though. This forum is much too small to list out all of the skills needed to be an effective Scrum Master.
Ditto to Mr. Baffa's response. There is a nice list of resources as a starting point for skills right here on this site: https://www.scrum.org/Courses/Professional-Scrum-Master/PSM-Subject-Are…