Is Mutual Funds What You Shouldn't Be Investing In?

I was reading Tony Rowan's book and he was talking about how index funds is what you should be investing in. Yes, as opposed to mutual funds. Like there's no one size fits all for everyone. So trust yourself as like a shopper and consumer that CPI thing that we talked about in the back of the book,. Consumer price index, like consumers account for 70% in the economy.