Buy low, sell high
Resell discounted items
Flip used electronics
Flip furniture
Flip sneakers and collectibles
Buy liquidation or clearance inventory
Repair and resell items
Arbitrage price differences
Trade in-demand domain names
Offer services and reinvest profits
Invest in stocks or ETFs
Buy and hold real estate
Lend money at agreed interest where legal
Start a small business and scale it
Reinvest profits into higher-margin opportunities