Eloquent JavaScript and the You Don't Know JavaScript series are my favourite books. Both available for free online. Depends on what you want to do. For work,

Eloquent JavaScript and the You Don't Know JavaScript series are my favourite books. Both available for free online. Depends on what you want to do. For work, yes React is king and has an absolutely huge ecosystem built around it. For fun? I'd look into Svelte, fixes a lot of the pain points of React and Vue. Also the Javascript DOM API has come a long way itself and IMO, while a library/framework is helpful if you're building a complex web app with lots of states, the great majority of websites out there don't need a framework and can be built statically with something like Eleventy.