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Honestly, these days you'd be better off learning Tailwind CSS[1]. I previously used Bootstrap, but Tailwind CSS is so much nicer.
I prefer Tailwind CSS over Bootstrap because it is a utility-first framework, allowing me to style elements directly with low-level utility classes, rather than relying on the predefined styles and components of the framework.
The Tailwind folks have done a good job making it highly customisable. Ultimately, it comes down to personal preference and needs.
[1] https://tailwindcss.com/
https://daisyui.com/
As for OP's question, just play with it! Futz with different classes and see what happens! A structured approach I don't think will work terribly well.