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Full-stack development in 2026 requires competence across frontend, backend, databases, and deployment—not expertise in everything. Focus on fundamentals like HTTP, JavaScript/TypeScript, HTML/CSS, and one backend language (Node.js recommended). Learn React for frontend, build REST APIs, master SQL databases (PostgreSQL preferred), understand authentication patterns (JWT with refresh tokens), and grasp basic DevOps (Docker, CI/CD). The T-shaped model works best: broad knowledge across the stack with deep expertise in 1-2 areas. Avoid framework chasing; understand underlying patterns. Start simple with tools like Vercel or Railway before graduating to AWS. Security, performance, and accessibility aren't optional. Most importantly, ship working software and learn from real production experience rather than trying to master every technology upfront.