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.