CSS/Bootstrap + Javascript/Jquery

What are you most proud of, and what would you do differently next time?

Love the Javascript stuff, more so than the pure front-end design and element positioning.

What challenges did you encounter, and how did you overcome them?

Trying to get a better grip on CSS Bootstrap, but am finding it inadequate for anything beyond very basic layout. Maybe Tailwind is the way the go?

What specific areas of your project would you like help with?

How do seasoned developers use CSS with libraries such as Bootstrap or Tailwind? Is vanilla CSS with a preprocessor like Sass an option? Or is it largely indidivual preference?