Enter Pretty Links
Many people see Pretty Links as simply a method of turning a long, complex URL into a shorted, simpler one.
And while it is that, more importantly, it turns a link to an outside website into one based on YOUR website.
So that, for example,
https://yourvendorswebsitecom/affiliatestuff/789$32bfg/this... might become
https://mywebsite.com/3g79
Note that not only is the link much shorter and, well, “prettier” but as far as a search engine is concerned, it’s an internal link within your own website.
So, you can use the generated pretty link in your blog post and anyone clicking on it will be taken to your vendor’s site via your affiliate link.
OR
If you use a landing page, you can replace the link on the landing page with the pretty link, while your blog post points to the landing page, giving you double the credibility.