Thank you all. I understand that order to maintain the android device I need the tool adb installed on my pc and thats the way to do cmdline maintenance of the android device. So I have familiarize myself with adp.
Meanwhile I installed “termux” on my android device, I am pleased with that, but it is apparently not the mean to install or uninstall apps. It rather seems to provide and give access to some sort of linux subsystem on the device.
I go into adb but not today. I come back to your answers soon.