The best niches for Amazon affiliate marketing depend on your interests. You can focus on health and wellness products. Fitness equipment and supplements have high demand. You can promote technology products like gadgets and accessories. People always search for electronics such as phones and laptops. Home improvement is another profitable niche. Tools and home décor items sell well. You can also target the beauty and skincare market. People spend on cosmetics and grooming products. You should focus on niches with high product variety. A niche with a strong audience ensures better earnings. Pick a niche that aligns with your expertise.