I've been reading that the market decline has been driven by huge short selling, not by selling of actual shares. It would be worse except that real people, attracted by the bargains, are actually buying stocks.
I think the short sellers got caught with their pants down when Trump gave a calming speech just before market close on Friday, hence the huge spike just before the close.
I had a brief discussion with a co-worker at shift change this morning - he's one that invests in individual stocks, and he had a lot of selling happen based on stops that he put on his own stocks. That is, automatic "sell if it gets below X" kind of thing. So that adds fuel to the fire.
Me, I'm kind of more of a mutual fund kind of guy, since I don't want to take the time to study my investments that deeply. Give me some 4 and 5 star funds with the types of investment strategies that I want, and let the fund managers do their thing.
It's neither a gain, nor a loss until you sell it and see the check. :)