![Some exchange-traded funds have posted stellar performance lately, but with no guarantee of future returns investors must beware. Getty](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/EKTGTXBEG366G7AKDHENZFLALY.jpg?smart=true&auth=8cec72c99a3e3b2351242489347103602e98a336e7e996abd9a7344444d0e25a&width=400&height=225)
Some exchange-traded funds have posted stellar performance lately, but with no guarantee of future returns investors must beware. Getty
Some exchange-traded funds have posted stellar performance lately, but with no guarantee of future returns investors must beware. Getty
These ETFs could plug a gaping hole in your investment portfolio
Funds with exposure to lithium, space exploration, semiconductors, automation and blockchain could offer more diversity