how to sell products online in amazon starts with signing up as a seller and identifying a niche with strong demand. Once you source your products, you create SEO-optimized listings to attract buyers. High-quality images, bullet points, and compelling descriptions are critical. You can choose FBA for hands-off fulfillment or ship yourself. Utilize Amazon advertising to drive traffic and monitor your metrics through Seller Central. Building brand trust and gathering reviews will support long-term growth.