Hi,
I’m thinking to install EndeavourOS on my Samsung Tablet A8.
Do you have any idea of a tutorial to do this?
I don’t think that this is possible. EndeavourOS isn’t made for mobile devices (Android tablets and smartphones) . Maybe check out LineageOS if your Tablet is Supported by them. I only found the 2019 version there.
For your device to have any chance to run EnOS, it should be supported by Archlinux ARM to begin with.