Spatie is a Belgian web-development agency and one of the most respected names in the Laravel ecosystem — the author of more than 350 open-source PHP / Laravel packages (Laravel Permission, Laravel Backup, Laravel Translatable, Laravel Image Optimizer, and many others) that anchor a substantial portion of working Laravel codebases. Spatie's paid course material extends the same depth into long-form video.
The CourseFlix listing carries two Spatie courses: Writing Readable PHP (the code-quality / readability discipline applied to modern PHP) and Testing Laravel with PHPUnit (the testing workflow for production Laravel applications).
Material is paid and aimed at PHP / Laravel developers ready to take code quality and testing as serious professional disciplines. For broader content, see CourseFlix's Laravel and PHP category pages.
