A mentor is someone with the expertise to help guide another professional's career or other personal developments.
Constructive feedback is actionable, specific advice aimed at helping improve performance or outcomes in a positive manner.
The Lean Startup method is a method of innovation that allows for the rapid development and launch of new products. It focuses on customer feedback, experimentation, and iterative product development.
Radical innovation is a type of innovation that creates new markets or dramatically changes existing markets. It produces highly differentiated, system-altering creations.