There are several online platforms where you can find free affiliate marketing courses. Here are a few options:

1. Wealthy Affiliate: Wealthy Affiliate offers a free starter membership that includes basic affiliate marketing training. They provide comprehensive courses and resources to help beginners get started in affiliate marketing.

1. Udemy: Udemy is an online learning platform that offers a wide range of courses, including affiliate marketing. While not all courses are free, Udemy frequently offers discounts, and you can often find free courses or promotions.

1. Coursera: Coursera partners with universities and organizations to provide online courses. While some courses require payment, there are also free courses available. You can search for affiliate marketing courses on Coursera and filter the results by price.

1. HubSpot Academy: HubSpot Academy offers various free courses on digital marketing topics, including affiliate marketing. Their courses are known for their quality and practical insights.

1. YouTube: YouTube is a vast resource for learning, and many affiliate marketing experts and influencers share valuable content for free. You can search for affiliate marketing tutorials, guides, and courses on YouTube.

Remember that while free courses can provide a good foundation, they may not offer as much depth or personal support as paid courses. If you find value in a free course and want to delve deeper, you may consider investing in a comprehensive paid course or joining a mentorship program to further enhance your affiliate marketing skills.