Depends on some things about your personal situation, particularly your age and risk aversion. Younger folks can safely go for more aggressive funds that have the potential for greater gain (and loss) while people who are prepping for retirement should be more hesitant and go for broader and safer funds.

For instance I’m under 30 and went for a tech fund that selected something like 25 individual tech stocks, and it’s performed well for me. It’s somewhat risky, but that’s why you diversify in other areas. You don’t want all your eggs in one basket (read: sector). If you’re completely lost, I’d recommend doing independent research, joining a credit union, and discussing some options with a financial advisor through your credit union.