'Core market' funds
Alexander says that investing in ETFs can be done with a minimum of fuss and muss.
"They track an index and have low expense ratios," she says. "You don't have to keep track of individual stocks or monitor an active manager."
However, she adds that there is no "appropriate" number of ETFs that every investor should own.
"The number of ETFs would depend on the investor's risk tolerance and portfolio size," she says.
As a general rule, she would recommend the funds above. She says both the broad market ETF and the mid-cap value ETF are good "core market" funds.
"Adding a value fund will create diversification, as well as having the potential to increase returns over time," she says.
Alexander does not recommend using bond index ETFs and suggests purchasing an actively managed bond mutual fund instead.
"Bond managers can actually add value to investors," she says. "The bond markets tend to be more inefficient, so it's possible to find extra returns over the index by using an active manager."