In short, irrespective of your audience's interests and the kind of content you publish, you can find relevant products to promote as an affiliate marketer.
People become successful in affiliate marketing by approaching the problem from a number of different angles. For example, some are great writers while others are comedians or pundits. Some give relatively uncontroversial advice to people via video or blog. Others take a hard stance against a hot button issue in the media to build up their audience.

In that case, social media communities are genuinely helpful. Try to be there and see if people are looking for any advice. It doesn’t mean that you spam them with affiliate links and force them to buy. It’s wrong!
In majority of the cases, affiliates get paid only if the consumer makes a purchase through the affiliate link. However sometimes they also get paid for generating leads or clicks.