Grant Sandersom runs the very successful YouTube channel 3Blue1Brown. In this talk he argues for starting with the concrete and discussing examples, before introducing generalisations, as a good basic approach when teaching technical material.
Angela Lee Duckworth has a great TED talk about passion, perseverance, grit, and the growth mindset.
Sal Khan, the mastermind behind the Kahn Academy, talks about mindsets and learning for mastery. I may not fully agree with all points in this talk, but it can still be food for thought.