Arbitrage Opportunities is the skill of identifying and evaluating profitable price discrepancies across markets. It combines market knowledge (what prices should be), analytical skills (quantifying profit after fees), and judgment (whether to trade). This is the manual, human side of arbitrage. A trader sees a chart showing Bitcoin at $40k on Coinbase and $41k on Kraken, calculates fees ($300 round-trip), net profit ($200 on $40k capital = 0.5% return), decides whether execution risk is worth it, and acts.