Are .html .php suffixes relevant for SEO today?

Question

HTML

Does the presence or absence of suffixes on pages affect search results?
How relevant is it to use sections without suffixes and end pages with suffixes.
Please write fresh and verified information.
According to my data, this will not affect the issuance, but a colleague refers to SEO courses from Yandex for 2013. So I decided to check.

Answer 1

It has no effect.
If you have a link with a bunch of GET parameters, then to increase the conversion and beautiful display in the search results, you need to add a minimum of micro-markup. But better, get rid of excesses in links through mod_rewrite or thoroughly rewrite the code.

Answer 2

Does not affect. Only on the appearance of the URL.

Answer 3

webmasters.stackexchange.com/questions/7797/seo-ht...