Hello! I am a beginner so I ma trying termux first "apt update" is working and then "apt upgrade" is not working saying that '1 is not upgraded 0 upgrading' so, professionals kindly help me. Thank you
Welcome to the forums
sudo apt update, just updates the list of your kernel and applications you have installed, sudo apt upgrade will download and install all and any upgrades available from the repositories of your distribution. When you get.
It is often linked to something you have installed, not in the official repository or could be a driver upgrade which is not suited to your machine.
if all is working then ignore it