CNBC's Bob Pisani spoke with Dave Nadiq, Director of Research at ETF Trends, Jan Van Eck, CEO of Van Eck Associates, and Harry Whitton, Head of ETF Sales Trading at Old Mission. They discussed the biggest trends and themes to watch in 2021 including Bitcoin, ESG, Active Investing and whether the record inflows into ETFs will keep on coming. In the 'markets 102' portion of the podcast, Bob continues his conversation with Dave Nadiq of ETF Trends.