I think you should try a few approaches and see what suits you better and makes you more productive.
Some suggestions are bootstrap 5, tailwind, bulma or any other suggestions you can find dev.to/theme_selection/best-css-fr...
But in general I think plain old CSS and new CSS3 is so powerful nowadays (with flexbox, grid and pretty much good support across all modern browsers) that you are better of using vanilla css and perhaps a preprocessor (SCSS, postcss) instead of trying to learn how each framework does things.
Thus learning the basics of CSS is invaluable for your future growth as frameworks might come and go but CSS will probably not change completely, will just improve.
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I think you should try a few approaches and see what suits you better and makes you more productive.
Some suggestions are bootstrap 5, tailwind, bulma or any other suggestions you can find dev.to/theme_selection/best-css-fr...
But in general I think plain old CSS and new CSS3 is so powerful nowadays (with flexbox, grid and pretty much good support across all modern browsers) that you are better of using vanilla css and perhaps a preprocessor (SCSS, postcss) instead of trying to learn how each framework does things.
Thus learning the basics of CSS is invaluable for your future growth as frameworks might come and go but CSS will probably not change completely, will just improve.