The Professionalism of Your Website
The first thing to be aware of is that the professionalism of your website is going to determine (at least partially) whether or not you are able to use this technique. You need to make your website look as good as possible, as mentioned in the very first chapter, in order to make this work, because you are going to be trading links with other websites and they aren’t going to want to have their link posted on a website that doesn’t look professional.
Also, they’re not going to want their link posted on the website that doesn’t have anything to offer them. For example, if your website is brand-new, Google isn’t going to care too much about links from you to their website. That’s especially true if you are linking to each other. Most of the time, links cancel each other out anyway. But this is only a concern if the person linking to your website is doing it to get a link back to raise their rankings in the search engines.
However, if you are simply linking to each other so that you can send traffic to your respective websites, this is something that is valuable enough for most people to want to trade with you. But your website still has to be professional. If you put a link to their website on your thank you page, people will go to their website only when they have already finished their purchase or email opt in from you and conversely, you will only get traffic from the other website when visitors that site reach the thank you page.