What everybody needs, most of all, is the ability to reject "bad philosophy." And philosophy is most worthwhile as a means to that end. When you start to consciously dabble in philosophy, what's most important is that you go all the way through: get familiar a lot of different philosophies that contradict each other. Then you return to a state of not constantly questioning everything, but you return with greater stability.
In a relatively free-market financial system, the way you grow your wealth is by risking it. This is inherently dangerous, but that danger can be mitigated with knowledge and experience. Broad-market index funds have performed well in the past but carry some hidden risks that may warrant dabbling in more creative investment strategies.
You should know your body very very well. The modern world is full of unique health hazards that we did not evolve to handle. And modern medicine, while extremely powerful, has critical gaps that we currently need to account for at the individual level.