If I had 2 months, infinite free time, and wanted to become a proficient web developer, what tools and technology stacks should I learn?

Assume sufficient aptitude, programming skills, etc

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Semantic HTML
CSS units/typography/colors
CSS layout (box model, flexbox, grid, media queries)
JavaScript (ES6+)
DOM API
Fetch API
Browser APIs (see Mozilla Developer, Google Developers)
Git
npm
Svelte, Solid, Vue or React
Components/design systems
Accessibility/ARIA
SvelteKit, SolidStart, Nuxt or Next.js
TypeScript

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(Don’t just jump right into React/Next.js like most folks - take some time to learn the fundamentals, then try out a different component framework for each project. You’ll stand out and be more adaptable/future-proof.)