To a large extent I made these discoveries too late (already a 30+ year mortgage, though now paid off). But I have benefited by discovering ways of investing at low cost, and of discovering the often hidden or at least camouflaged fees that the so-called financial services 'industry' siphon off (a modern day scandal).
So go exploring: try Mr Money Mustache's blog (USA), The Escape Artist (UK) and PensionCraft. And more here about other FIRE sites. Don't be put off. Starting early is the great thing. Spread the word.