Analytics are limited. Unlike with conversions made directly on your WordPress site, you’ll be limited in terms of what you can learn about the people making purchases through your affiliate links. While Amazon does provide you with details about clicks and sales, you won’t get deep insights into who the consumer was and what they did on your site before they got to that point that you would with Google Analytics.
SkimLinks is probably best for bloggers who want to write content around the affiliate link rather than add affiliate links to existing products. SkimLinks offers a lot of tools to compare commission rates and offers in order to customize your content to optimize your income. Once nice aspect of SkimLinks is that it offers lots of products for non-US creators, including popular UK brands like John Lewis and Tesco.
Hey. Yes you can use just one website to promote multiple affiliate programs, but I’d say that your website should focus on just one niche. So you mention, SellHealth, that would lead me to believe your site is about health and fitness. I would then advise you to stick to that niche rather than promoting unrelated products like dog leashes and fashion accessories.