@lucia-3 prova a dare una occhiata qui

https://aulab.it/notizia/192/come-imparare-a-programmare-con-un-corso-php
https://www.udemy.com/courses/search/?src=ukw&q=php
https://www.w3schools.com/php/
https://www.codecademy.com/learn/paths/php-skill