Some of the most common off-page SEO mistakes beginners make include focusing on quantity over quality when building backlinks, acquiring links from irrelevant or low-authority websites, using overly optimized anchor text, neglecting competitor analysis, and relying on spammy link-building tactics. These mistakes can harm website credibility and potentially affect search rankings, so it is generally better to focus on earning relevant, high-quality backlinks, building genuine industry relationships, creating valuable content, and maintaining a natural and sustainable off-page SEO strategy.