You Can't Do Anything, So Stop Worrying
You cannot do anything about flucuating financial markets, so stop trying. That's the message of an essay by David Booth from DFA funds published recently at Worth.com
(article at https://www.talkingrealmoney.com/show-topics/)
Then, Don take a call about the differences between Vanguard and Fidelity funds.
Finally, he discusses small cap value investing and which Vanguard small cap index you should use.