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How do you trade them? My platform does not accept them. And what is the significance of it?
It takes some detective work to find which ETF(s) go with which index, and then which are the best of those. You could start with the symbol catalog on Stockcharts - enter the index name and "etf", like "sp500 etf" and then start exploring. Or you could google "index etfs" and go from there.
I wish Stockcharts will include the ETF under the $ sign that we could trade.