Being able to follow-up the temperature of the main components of your computer such as CPU temperature, HDD or SSD temperature, CPU usage, … can enable you to prevent / troubleshoot problems before they become too troublesome.

sudo apt install lm-sensors hddtemp

Start the detection of the sensors available on your machine

sudo sensors-detect

Check that it works and can capture information from the sensors

sensors

Install PSensor

sudo apt install psensor

Then you will be able to find the software among your applications list

There you will be able to configure your preferences to show only the information suitable for your own needs.