Are these still the go-to examples? Any other sites that you particularly like the design of?
Is Dribbble still the best place to go for inspiration?
It's a really easy-to-use format (one quick tip on each page, with clear examples).
It's from the people who made Tailwind, a CSS framework that's basically a reimagining of Bootcamp for the Javascript/component era.
Check out some of their templates: https://tailwindui.com/templates
These are lookalike "modern" designs that you can pay to use, or just draw inspiration from. Imitation == flattery and all that.
Along similar lines, check out the free Next.js templates: https://vercel.com/templates/next.js
If you want to build up from components instead, Tailwind offers a component library too: https://tailwindui.com/components
For React, I prefer the astoundingly good MUI framework (amazing components with lots of customizability, a good enough default look, and great documentation): https://mui.com/ If you end up going this route, using their Figma kit (https://mui.com/store/items/figma-react/) plus the Refactoring UI book from above should allow you to whip up a pretty standard-looking, "pretty enough" design in very little time. And then implementing it using the actual MUI lib would just take a few days.
There's also Ant Design: https://ant.design/
And Chakra UI: https://chakra-ui.com/
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For more theoretical stuff (i.e., less visual but still very valuable), the UX research group Nielsen Norman still has a treasure trove of valuable advice: https://www.nngroup.com/articles/top-ten-guidelines-for-home...
You should know the basics of accessibility (beyond general usability, this alos means alt text, header levels, contrast ratios, readability, screen readers, keyboard navigation, special considerations for the hard of sight and hearing, etc.): https://www.w3.org/WAI/standards-guidelines/wcag/ or at least use an easy checklist tool like Microsoft's WCAG analyzer: https://accessibilityinsights.io/