If you are trying to master CSS you absolutely should not start in Bootstrap or Tailwind.
Frameworks are designed to speed up development time and eliminate the need to write often reused styles. They also function well for developers with little CSS knowledge who wish to create functioning UIs, for example back end developers.
If you want to truly learn CSS write your own CSS and properly get to terms with what properties have what effect. Your comment even says "bootstrap allows you to build responsive sites" which is just wrong. Proper markup and media queries allows you to create responsive websites, which one would understand once they start writing their own CSS rather than relying on a frontend framework.
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If you are trying to master CSS you absolutely should not start in Bootstrap or Tailwind.
Frameworks are designed to speed up development time and eliminate the need to write often reused styles. They also function well for developers with little CSS knowledge who wish to create functioning UIs, for example back end developers.
If you want to truly learn CSS write your own CSS and properly get to terms with what properties have what effect. Your comment even says "bootstrap allows you to build responsive sites" which is just wrong. Proper markup and media queries allows you to create responsive websites, which one would understand once they start writing their own CSS rather than relying on a frontend framework.