Does SEO require coding?

The short answer is: no, SEO typically doesn't require much (or any) hands-on coding. You can absolutely do a fine job of SEO without touching code. But the longer answer is that yes, a good sense of how programming works, or even an ability to do a bit of coding yourself, is always a useful skill to have.
Technical SEO refers to technical aspects of a website that can be optimized to improve its ranking and visibility on search engine results pages. Technical SEO tactics can include indexing, rendering, and website architecture with the goal of making a website faster and easier for web crawlers to find and understand.