How to do SEO optimization of a dynamic site with modern methods?

Question

PHP

Hello! There is an online store, quite simple, in PHP, all pages are included with an index, on the product selection page everything is loaded ajax, i.e. The product description is not visible to the search engine. I'm not familiar with modern search engine optimization at all. I remember that before the robot did not follow the link with GET requests, the same thing about ajax. But I also know that there are modern methods for optimizing such sites. Can you please tell me how to make all content properly indexed and available to the search engine? And another related question: if I move all the pages outside the site root so that there is no direct access to them (otherwise they will see errors, because the content depends on the request), will this prevent the robot from indexing it? Thanks in advance for your help!

Answer 1

At the moment, search robots understand javascript and can understand ajax, but not all. You have to experiment. First, look at how your site is indexed. For what queries it pops up in the search, etc.
How? And for what? By POST? Complete stupidity.
The robot does not walk through files, it walks through links and indexes what is available to the user from the browser. At least put them on a neighboring server.