I generally don’t pick stocks on my own, except a few I buy for dividend investment. To me direct stock investing is too risky to my limited knowledge about it. I rely on expert fund managers and thus buy mutual funds instead. In my employer 401(k) I have options to buy index funds as well as target date funds.
My 401 (k) portfolio is invested in three different target date funds (2030 retirement fund, 2035 retirement fund and 2040 retirement fund) and a couple of index funds, International and large cap index funds.