Está incluído no projeto o HTML e CSS utilizado :)
Curso Flexbox do Wesbos: https://flexbox.io/
Curso Grid System do Wesbos: https://cssgrid.io/
Cursos grátis da Rocketseat: https://rocketseat.com.br/starter
Curso UX da Awari: https://awari.com.br/
Caniuse: https://caniuse.com/
SuperheroJS: http://superherojs.com/
BEM CSS: http://getbem.com/
Developer Roadmap: https://github.com/kamranahmedse/developer-roadmap
Frontend Challanges: https://github.com/felipefialho/frontend-challenges
Flexbox 101: https://css-tricks.com/snippets/css/a-guide-to-flexbox/