Video describing traditional 2x4 16 inch on center framing versus advanced framing with 2x6 stud walls at 24 inch on center, insulated corners and headers, wall stud-ceiling joist alignment, etc. providing a strong wall with more room for insulation.
Video from Cold Climate Housing Research Center on how warm air typically leaks out of homes through attics via the stack effect and how to mitigate these effects through building practices.