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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https://www.learnenough.com would be my go to. Still think Rails is a good starting point to learn how all the pieces fit together. It’s mature enough for beginners not to get stuck randomly. Also it’s opinionated enough that you don’t waste time on analysis paralysis.