How to run codeigniter4 in shared hosting ?

Hello, 
I am learning framework from the beginning and I would like to use Codeigniter for my projects. As I am working with a shared hosting I would like to know how to install Codeigniter4 in shared hosting properly. I have read the user guide and also search through the forum but there is no good solution. Some people saying to move the public folder contents to the root directory and some suggestions to create an index.php file in the root and point it to the public/index.php folder. But there is no proper guideline. Can anyone give me a proper guideline to how I can run my application in the shared hosting? I saw the Codeigniter3 user guide, and it was super easy for the beginner. 
There should be some proper guideline for the beginner. 
Can anyone help?