w3school(html/css/js): https://www.w3schools.com/html/
mozila firefox: https://developer.mozilla.org/pt-BR/docs/Web/HTML
odin project: https://www.theodinproject.com/paths/foundations/courses/foundations#html-foundations
freecode camp: https://www.freecodecamp.org/learn/2022/responsive-web-design/#learn-html-by-building-a-cat-photo-app