I found the DFM series from Dragon Innovation to be incredibly insightful.
https://www.youtube.com/watch?v=pFFtao43tkw
EDIT: Changed link to first video of the DFM series
240 karma · joined September 22, 2017
https://www.youtube.com/watch?v=pFFtao43tkw
EDIT: Changed link to first video of the DFM series