You can teach yourself affiliate marketing. There are plenty of free resources online like blogs, videos, and courses. You should start by understanding the basics of affiliate marketing. You must learn about affiliate networks, products, and commissions. You should focus on building a website or blog to promote products. SEO knowledge will help you attract traffic from Google search. You can join affiliate programs and start promoting products that match your niche. Practice is key. You should track your results and adjust your strategies. With time and effort, you can succeed in affiliate marketing without formal training.