- The role of the team coach is to support the group to reach its goal, and ensure security for learning.
I'd use a comma. Without it, the reader might think that the role of the coach was to support the group (1) to reach its goal and (2) to ensure security.
I'd say, " help the group to reach it's goal' or 'support the group inr eaching its goal'.
- If you feel that certain values and principles should be followed by the team, and individuals should act accordingly
A comma stops the reader thinking that the values and principles should be followed by both teams and by individuals. I's also add a 'that' before 'individuals'.