You're going to be doing product reviews and recommendations, so pick a topic that you enjoy and about which you can demonstrate some expertise. Choose a narrow enough niche to be distinctive—for example, bands from your city, left-handed guitarists, music for a certain kind of dancing, authors of a certain religion, books about business, or arts and crafts resources. If you can't stay passionate about the topic, that will show.
This is the standard affiliate marketing structure. In this program, the merchant pays the affiliate a percentage of the sale price of the product after the consumer purchases the product as a result of the affiliate’s marketing strategies. In other words, the affiliate must actually get the investor to invest in the product before they are compensated.
Cost per action/sale methods require that referred visitors do more than visit the advertiser's website before the affiliate receives a commission. The advertiser must convert that visitor first. It is in the best interest of the affiliate to send the most closely targeted traffic to the advertiser as possible to increase the chance of a conversion. The risk and loss are shared between the affiliate and the advertiser.
The General Data Protection Regulation (GDPR), which took effect on May 25, 2018, is a set of regulations governing the use of personal data across the EU. This is forcing some affiliates to obtain user data through opt-in consent (updated privacy policies and cookie notices), even if they are not located in the European Union. This new regulation should also remind you to follow FTC guidelines and clearly disclose that you receive affiliate commissions from your recommendations. 
The one thing to be aware of with WordPress Amazon affiliate plugins is that you don’t want to use one that offers link cloaking. This is a method used to protect affiliates from a threat known as affiliate link hijacking. However, Amazon expressly forbids the cloaking of their links, so you’ll want to avoid plugins that do that or always be sure to disable that functionality if they give you the option.
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.
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