The topic you choose must have enough depth that you can create a lot of content for it. This is important for building an authoritative site, for search engine optimization, and most importantly, for the end user. If you don't have enough content about a topic, you're not going to be taken very seriously as an authority on the topic and it's unlikely you can convince someone to make a purchase from you. 
My first affiliate sale was somewhat of a family affair and it only took a few days at most. It was in December 2008. One of my sisters wrote a book on foreclosure cleaning. If you remember, foreclosures were big in the news from 2007 to about 2011/2012. The collapse of the financial — and hence, housing — industry flooded the market with foreclosures.
Affiliates are most successful when the products they promote match the interests of their followers and subscribers. In addition, many successful affiliate marketers advise recommending and promoting only products that the affiliate is personally familiar with. That’s because familiarity with the product, program, or service helps build trust between the affiliate and end-user.
Community Support: The number one thing I personally believe makes Wealthy Affiliate stand out as the best affiliate marketing training is the community. Wealthy Affiliate has a large network of people they’ve helped at different stages of success that you can tap for real-world expertise. This large community of affiliate marketers help answer questions, shares their tips for success and is an instant professional network you can utilize to help grow your business.

For example, the content on Super Weddings is useful whether you're organizing a wedding today or next year. All the content on the site is created accordingly. To make things easier for the audience, it is separated into categories to make it very convenient for the reader to find what they're looking for. This, of course, is also very good for SEO. 
If the answer to each of these questions is a resounding yes, rather than jumping to conclusions immediately, take time to research whether or not others are out there making a sustainable affiliate income from products and content in this niche. In a sense, competition is a good thing here—it'll help you validate your idea and prove that it's worth of building a business around.
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