Where can I read about the microstandards of CSS classes and the use of HTML elements?

Question

css

Hello, tell me the microstandards of CSS classes, how to name, use, maybe there are well-established canons? Interested in general, universal approaches.
The use of HTML elements is also of interest. But not a description, for example, p - for a paragraph, but usage features, for example, for graphic icons, design, etc.

Answer 1

habrahabr.ru/company/yandex/blog/211638