Khan Academy
Khan Academy: Learn: The Growth Mindset
This article showcases the difference between a growth mindset and a fixed mindset.
PBS
Sesame Street: Breathe, Think, Do
Frustration is a normal part of life, but it can overwhelm kids and bring up a lot of big feelings. You can help them to use the "Breathe, Think, Do" strategy to calm down, identify their feelings, and work to solve their problem.