Some common patterns to observe in stock price charts include trend lines, support and resistance zones, Fibonacci levels, triangles, flags, and head and shoulders patterns. Trend lines show market performance and can indicate uptrends, downtrends, or sideways movements. Support and resistance zones represent price ranges where buyers or sellers are strong enough to prevent the price from falling or rising, respectively. Fibonacci levels help predict potential support and resistance zones. Triangles and flags are consolidation patterns, while head and shoulders patterns are reversal patterns.