Common and reliable chart patterns in Forex include the Head and Shoulders (a reversal pattern signaling trend change), Double Top and Double Bottom (indicating bearish or bullish reversals, respectively), and Triangles (showing consolidation before a breakout). Flags and Pennants are continuation patterns, formed after a sharp price movement, signaling brief consolidation before the trend resumes. Recognizing these patterns helps traders anticipate potential price movements based on past price behavior.