How to create blog posts on Magento 2 from a script?

Question

Magento

there is a store on Magento2 with an extensive range of products;
we create documentation, guides, tutorials, etc. for products.
we will store all the documentation on github;
it is necessary that when creating a new guide, it will automatically fast on the store's website in the blog, as well as on the page of the relevant product.
How to do it right?
Now the Amasty plugin is used, but we will replace it if necessary.