Embark on a comprehensive journey to build a full-stack MERN (MongoDB, Express.js, React, Node.js) blog application in this extensive tutorial. Learn to implement user authentication with JSON Web Tokens, create responsive designs using CSS variables and media queries, and perform CRUD operations on blog posts. Master the use of React Hooks, Context API, and React Router 6 for efficient front-end development. Dive into back-end technologies like express-fileupload for image handling, bcryptjs for password encryption, and mongoose for MongoDB interactions. Gain practical experience in user registration, login, profile management, and post creation with image uploads. Follow along as the tutorial guides you through setting up the project structure, styling components, implementing responsive design, and connecting the front-end to the back-end. By the end, you'll have built a feature-rich blog application with secure user authentication and full CRUD functionality.