ETFs (exchange traded funds) are booming - and while they've given investors easier access to many different markets, the principles of investing still apply: diversification, time in the market, and understand what you're investing in.InvestSMART's ETF Scorecard tells us the best and worst performing ETFs, and gives everything in between a star rating out of five. Ron Hodge, Group CEO of InvestSMART, talks to Sean Aylmer.This is general information only. You should seek professional advice before making investment decisions. Find out more: https://fearandgreed.com.au See omnystudio.com/listener for privacy information.