In Forex you’d have to learn how the made is made (the main principle), available currency pairs, timeframes, margin, leverage, brokers, types of charts, technical analysis, candlesticks and their patterns, chart patterns, harmonic patterns, support and resistance, fibonacci, popular chart indicators (you cannot learn them all as there are thousands of them), pivot points, Elliott Wave Theory, divergences, breakouts, fakeouts, entry, exit, stop loss, take profit, market trades, pending orders, limit and stop orders, breakvene and trailing stop, risk management, scaling in/out, how to create your own trading strategy, etc.