The Art of Teaching: What are the most effective & proven methods for successfully imparting a concept/idea to another
Your question is extremely broad so all I can do is give you an extremely broad answer. More specifically, I'll provide you a study done by John Hattie (2008), who meta-analyzed 800(!!) meta-analyses on effective teaching methods, used in primary education among others. 

The linked document shows a "brief" overview of the different methods rated and sorted by their effect sizes. Some of the intervention may be more relevant to you compared to others. Providing feedback, for instance, is more difficult in indirect communications such as video's. 

Hattie has also written much about providing feedback and how that affects students' learning ability (e.g. Hattie, 2007)

Hattie, J., &amp; Timperley, H. (2007). The power of feedback. Review of educational research, 77(1), 81-112. 

Hattie, J. (2008). Visible learning: A synthesis of over 800 meta-analyses relating to achievement. Routledge.