[Q] How do i create App Folders on App page? plus few other questions topic

Hi

i hav found the way to make folders on the home screen but not on the apps screen like on my galaxy where you can make folders and organise the apps.
does anyone know how to do this?

Also i cant find "my files" like in my galaxy the file explorer/manager.

Last is the task manager where you can kill all apps in 1 go and see ram usage how do i get to it?