Good resources where I can learn how to create mobile first websites?

Question

css

Hello.
I'm a front-end beginner and I want to learn how to build professional websites using the Mobile first approach. I have little experience with media queries and tried breakpoints in one of my projects. I would like to see the whole process. How is a website created that can be used equally well on a mobile device and on a desktop.
Recommend a resource, a book, a course, an article (possible in English) where I can dig at least some part of this process.
Thank you in advance.

Answer 1

book of the founder of the approach:
www.mann-ivanov-ferber.ru/books/book-apart/mobilfirst
www.lukew.com/resources/mobile_first.asp