arbitrage is too broad to answer, and picking the wrong flavour first is why most people quit. the real split is capital-heavy vs skill-heavy. retail/product arb needs cash upfront and eats it in fees and dead stock while you learn. service/traffic arb (buy attention or labour cheap, sell the outcome dearer) needs almost no capital but needs you to actually understand the demand side. start skill-heavy so a mistake costs you time not money. whats your budget and how many hours a week, because that decides the lane far more than the niche does.
