How to Hack the Stock Market- Do's It Work better For Bulls or bears

I know people who don’t work and only invest in the stock market. They make more than enough to pay their bills and stash a good amount away? How do you do that? How much do you need? Can How to Hack the Stock Market work for  people make money in the stock market in good and bad market (bull and bear)? I know stocks are cheap right now, but once stocks reach their highs again, how do people make money?

Thanks in advance to all whom answer.