It is a very easy way of earning money as you just need to search a product, promote it to others and earn a piece of the profit by selling it. Affiliate Marketing is one of the purest online businesses where most people are engaged in making some extra income. It can be done either via social networking, blogging, email and SMS marketing, etc. As of now, blogging is one of the most effective ways.
I was pretty familiar with the most obvious ways to make money, like selling your own products or advertising, but I knew very little about affiliate marketing.

For example, if your blog is about work productivity or related topics and you discuss tools for boosting productivity, you can incorporate your affiliate links for products that boost work productivity. This ensures organic promotion and encourages the customer to try the recommended tools.
For Google, your affiliate links are a means of earning affiliate commission (or, in other words, yet another type of a paid link). And since paid links are far from being a natural authority signal, Google would like to remove those links from calculating link authority. This is why one of the basic requirements for you is to add the nofollow tag to all affiliate links.