Becoming a full-stack WordPress developer requires a combination of skills in web development, including both front-end and back-end technologies, as well as a deep understanding of the WordPress platform. Here's a roadmap to help you become a proficient full-stack WordPress developer:

1. Basic Web Development Skills:

• HTML/CSS: Learn the basics of HTML and CSS as they form the foundation of web development.

• JavaScript: Understand JavaScript fundamentals for interactive web development.

• Responsive Design: Learn about responsive web design and frameworks like Bootstrap.

2. Front-end Development:

• Advanced JavaScript: Dive deeper into JavaScript, focusing on ES6+ features.

• CSS Preprocessors: Learn Sass or Less to write more maintainable and readable CSS code.

• Front-end Frameworks: Master popular front-end libraries/frameworks like React.js or Vue.js.

• Version Control Systems: Learn Git and GitHub for collaborative coding and version control.

3. WordPress Basics:

• WordPress Installation: Set up a local development environment using tools like XAMPP or MAMP.

• Understanding the CMS: Learn how to use WordPress as a content management system.

• Themes and Templates: Understand the WordPress theme hierarchy and template system.

• Plugins: Learn how to develop custom plugins to extend WordPress functionality.

4. Back-end Development:

• PHP: WordPress is built on PHP, so have a strong grasp of the language.

• Database Management: Learn MySQL for managing WordPress databases.

• RESTful APIs: Understand how to create and consume RESTful APIs in WordPress.

5. Advanced WordPress Development:

• Custom Themes: Develop custom WordPress themes from scratch using HTML, CSS, and PHP.

• Custom Plugins: Create custom plugins to add specific features or functionalities to WordPress sites.

• Security: Learn about WordPress security best practices and techniques.

• Performance Optimization: Understand caching, minification, and other techniques to optimize WordPress websites.

6. Testing and Debugging:

• Debugging Tools: Familiarize yourself with debugging tools like Xdebug for PHP.

• Testing: Learn unit testing and integration testing for WordPress applications.

7. Version Control and Collaboration:

• Git/GitHub: Master version control using Git and GitHub for collaborative development.

• Code Reviews: Participate in and conduct code reviews to improve code quality.

8. Continuous Learning:

• Stay Updated: WordPress and web technologies constantly evolve; keep learning about the latest trends and updates.

• Community Involvement: Engage with the WordPress community, attend WordCamps, and participate in forums and discussions.

9. Soft Skills:

• Communication: Develop good communication skills for interacting with clients and team members.

• Problem-Solving: Enhance your problem-solving abilities, a crucial skill in development.

10. Optional Skills:

• SEO: Learn about SEO best practices and how they apply to WordPress websites.

• UI/UX Design: Basic understanding of user interface and user experience design principles.

Remember that becoming proficient in WordPress development takes time and continuous practice. Work on projects, contribute to open-source and never stop learning to stay ahead in the rapidly changing web development landscape.