This is the system with which I earned my first euros, and in my opinion it is one of the most affordable ways for any beginner who wants to generate passive income. It hardly requires knowledge, the investment is almost zero and its income potential is very high. In addition, once assembled you can practically forget about it: it will only require minimal maintenance. Affiliate marketing consists of creating a website where you will publish product analysis and recommendations. In these analyzes you will put links to other web pages where the product is sold. If you end up buying it, the seller will give you a commission for referring a customer. Logically, you must first have reached an agreement with those web pages. Luckily, today there are affiliate platforms (the best known is Amazon Affiliates) where you only have to register to be part of that agreement. Let's say you are passionate about photography. You could create a web page where you would post reviews of different cameras or lenses with a link to the product page on Amazon for readers interested in buying. This, for example, is an affiliate link. Your website would appear in search engines like Google when people searched for analysis or comparisons of those cameras. They would go into your article, click on the affiliate link, and if they ended up buying, Amazon would give you a percentage.