As far as JavaScript both backend and front, I learned both by building several personal projects with SvelteKit and Vite as well NextJS. And yes, I know HTML5, as far as CSS I only really know how to use TailwindCSS not pure CSS syntax. It wouldn’t be hard too hard to pick it up because I’ve used it in the past, but that was years ago at this point and it seems it has changed quite a bit since then.