Keyword stuffing. This involves cramming as many keywords as possible into website content, hoping to rank higher in search results. While this might seem like a quick way to boost visibility, it can actually harm your SEO efforts. Search engines are designed to penalize websites that engage in keyword stuffing, as it creates a poor user experience and makes content difficult to read. Search engines prioritize high-quality, user-friendly content and will penalize websites that try to game the system.