How can i code a web app in php?

Question

I want to learn all there is to coding web apps in php and mysql. I have googled around with no success.

Any tutorials and free courses are appreciated.

Answer 1

https://paulstamatiou.com/how-to-code-your-first-web-app-part-1/

Answer 2

Thanks but isn't there an up-to-date tutorial of the same?
I run in multiple errors using that tutorial.