Building a Personalized Code Learning Platform with LangChain 0.2 and Next.js 15

87% of developers abandon self-paced learning platforms within 14 days due to generic, one-size-fits-all content, according to a 2025 Stack Overflow survey. After 15 years building developer tools and contributing to LangChain and Next.js ecosystems, I’ve found that personalized, context-aware learn