A startup that provides coaching for Facebook and LinkedIn managers shares the 3 skills that every new boss should learn

• BetterUp is a startup that provides executive coaching for tech employees in Silicon Valley.
• We asked them to crunch user data and find the three skills that mid-level managers work on the most with their coaches.
• Successful managers set goals for their team and communicate them clearly, build a culture of trust, and adopt a "growth mindset."

When a worker bee gets promoted to manager, they may learn that the technical skills they mastered as an employee won't carry them as far in a leadership role.

That's according to a startup called BetterUp, which provides coaching to employees of tech companies in Silicon Valley, including Facebook, Salesforce, and LinkedIn. Employees meet virtually with licensed therapists, psychologists, and coaches for on-the-clock counseling.

Founded in 2013, BetterUp works mostly with mid-level managers who show potential, according to their employers - though they could benefit from grooming.

"Unlike the C-suite executives who have been around the block," new managers have a chance to develop their soft skills without having to "unlearn" certain unhelpful behaviors, according to Dr. Jacinta Jiménez, a psychologist who heads up the coaching department at BetterUp.

We asked BetterUp to crunch the data and find the three skills that new managers worked on the most with their coaches. They were: goal-setting and team communications, building a culture of trust, and "growth mindset." Here's what that means.