I chose to put my website on Google Cloud but I have no idea how to achieve that. I have a little experience in Linux and no experience at all by setting up any hosting for a website.
Questions here are:
Is that possible to set up a website if it is written in PHP+MySQL (and, of course, Javascript) ?
If yes:
How? How does it work?
For Google App Engine:
PHP runtime is currently in limited preview. (so not everything is working as expected) And instead of using MySQL, you have to use CloudSQL. For details please see here: https://developers.google.com/appengine/docs/php/cloud-sql/
You don't need any Linux experience for using GAE, but you will need to read through the documentations.
Javascript is client side program so it doesn't matter with the server.