A monitor of resources. This website contains the .deb package of btop optimized for Raspberry Pi OS 11 (bullseye) armhf (32-bit).
curl -sSfL https://raw.githubusercontent.com/mapi68/raspi-btop/master/raspi-btop-install | bash
sudo apt --purge remove raspi-btop -y
For additional info about btop , go here