One ETF that will fit in almost any portfolio is the Vanguard S&P 500 ETF (NYSEMKT: VOO). The S&P 500 (SNPINDEX: ^GSPC) index is a curated list of roughly 500 U.S. companies. If you are looking to track the market,

The energy sector may not benefit as much from prevailing market themes like artificial intelligence, robotics, or cloud computing, but it does include a variety of quality dividend stocks with inexpensive valuations.

Being able to buy and hold anything means you must own the right kinds of investments to begin with. If you're looking for a more passive approach to investing but don't want to sacrifice your potential gains,

Vanguard is one of the gold standards when it comes to low-cost exchange-traded fund (ETF) options. Undoubtedly, passive investing (typically with index funds) tends to be wildly popular among the retail crowd.

If you're new to investing and don't have a lot of money to get started, don't fret. The best place for new investors to begin is often with exchange-traded funds (ETFs), which will give investors instant diversification through a portfolio of stock holdings.

If you've been an investor for any length of time at all, then you've almost certainly been advised to start (and maybe even finish) with index funds like the Vanguard S&P 500 ETF. This fund is of course simply meant to mirror the performance of the S&P 500.