Here are some general steps you can take to become a full-stack web developer from scratch:
Learn the basics of programming and web development: Start with HTML, CSS, and JavaScript as these are the basic building blocks of web development. You can use online resources such as Codecademy, FreeCodeCamp, and W3Schools to learn these languages.
Learn a back-end programming language: Choose a language such as Python, Java, Ruby, or PHP, and learn the basics of how to use it for server-side programming.
Learn a web development framework: Depending on the back-end language you choose, there are various web development frameworks available such as Django, Ruby on Rails, Express.js, and Laravel. Learn how to use one of these frameworks to build web applications.
Learn a database management system: Learn how to use a database management system such as MySQL, MongoDB, or PostgreSQL to store and manage data for your web applications.
Learn version control: Learn how to use Git for version control and how to use GitHub or Gitlab for storing and collaborating on code.
Build projects: Start building projects using the skills you have learned. You can find many project ideas online and use them to practice your skills.
Keep learning: As technology is continuously evolving, it's important to stay updated with new technologies and programming languages. Join online communities, attend meetups and conferences, and continue to learn new skills.
Get real-world experience: Look for internships or entry-level developer positions. Participate in hackathons, and open-source projects, and contribute to other people's projects.
Keep in mind, becoming a full-stack developer is a continuous journey and it will take time and effort to become an expert, but with patience and persistence, you can achieve your goal.