To become a full-stack web and mobile developer, you’ll need to gain a broad set of skills that cover both front-end and back-end development for web and mobile platforms. Below is a breakdown of the essential skills and technologies you should learn:

Web Development

Front-end:

1. HTML: The markup language used for structuring web pages.
2. CSS: Styling the HTML elements.
3. JavaScript: Making the web page interactive.
4. Frameworks and Libraries: React, Angular, or Vue for UI; Bootstrap for CSS.

Back-end:

1. Programming Languages: Node.js, Python (Django or Flask), Ruby on Rails, Java, or PHP.
2. Database Management: SQL (MySQL, PostgreSQL) or NoSQL (MongoDB).
3. Web Servers: Apache, Nginx.
4. API Development: RESTful APIs, GraphQL.

DevOps:

1. Version Control: Git.
2. Deployment: Docker, AWS, Heroku.
3. Continuous Integration/Continuous Deployment (CI/CD): Jenkins, GitLab CI.

Mobile Development

Native:

1. Android: Java/Kotlin with Android Studio.
2. iOS: Swift with Xcode.

Cross-platform:

1. React Native: Uses React and JavaScript.
2. Flutter: Uses Dart programming language.

Mobile Back-end:

1. Firebase: Real-time database, authentication, etc.
2. REST APIs: Connectivity between mobile app and server.

General Skills:

1. Data Structures and Algorithms: Essential for coding interviews and efficient problem-solving.
2. Problem-Solving: LeetCode, HackerRank challenges.
3. Soft Skills: Communication, teamwork, problem-solving.

Learning Path:

1. Start Small: Begin with HTML, CSS, and JavaScript for web development.
2. Deep Dive: Choose a stack (MERN, MEAN, LAMP, etc.) and go deeper.
3. Mobile: Learn native or cross-platform mobile development.
4. Projects: Create a portfolio with real-world projects.