Most beginners commit fatal mistakes that restrict the potential of their affiliate marketing website. One of the largest is selecting a niche solely on profitability without evaluating demand from the audience or personal passion. Others forget about SEO, publishing with no keywords or plan. Don't pack affiliate links or promote multiple products simultaneously—it overwhelms users and lowers trust. Your site should be about delivering value, not selling. Another error is neglecting mobile users. With increased phone traffic, optimization for mobiles is a priority. Not informing affiliate relationships will also cost credibility. Remain truthful, genuine, and helpful. Deal with reliable networks such as vCommission in order to only promote real deals. Avoid making these mistakes sooner to build a sound, stable affiliate marketing website that generates sustainable long-term revenues rather than momentary clicks.