Linuxmint 20.1. How do I monitor CPU temperature?

Pages like https://linuxsoftware.moncerbae.com/...ture-on-linux/ are only a quick search away.

You can also do .sudo apt-get install xsensors. that brings up a GUI showing the same things. I added it to my panel for quick action.

I think monitors are desktop environment dependent.

I'd like to know what is most popular on XFCE.

Not at all.
I tried xsensors yesterday, but it doesn't give me anything my conky doesn't give me already.
But try it by all means, it might integrate well into your XFCE desktop.
OTOH, I believe there's a panel plugin for you.

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I run GKrellm which monitors CPU activity, including core and GPU temperatures, also shows Procs, disk and network activity plus uptime. I keep it as a column of indicators stuck to the RHS of my RH monitor. I'm running Mint 18.3 but it works just the same in 20.1.

Play Bonny!

Little note One the Dev machine I used to comple with the most old amd 8350 fx would get hot fast that wasnt the issue. Later on after I was gifted
a ryzen 3700x machine with 1080 gtx thats all I wanted for media. Nice gift.

I took my old machine apart cleaned it. And found thermal paste could have been better.
anyone knows that clip on style is a bad design by AMD easy to scrape the paste to one side.

Notified the pc maker I have used many times. They are the best. ecollegepc
I only got care and wonderful help from the pc maker.
Real people that answer the phone and will talk geek.

If your worried about heat. Your really not going to get any benefit from the sensor . That is hind sight.
All modern cpu scale back. The hind sight is if you can see the wattage scale back then you may upgrade cooling.
If you feel cool looking at a temp you have no control over hey.
I got a ram defragger for Linux works great.

A monitor such as gkrellm does not control temperatures, but it does give the user a quick view of what is happening. It monitors temps, fan speed, cpu activity, and more so there is a real time snapshot of activity to look at.

If something seems odd, like a fan suddenly stops, or a temp suddenly changes, or a temp is near a limit, etc., it provides a way to see that in real time and take action needed.

Just as an example:
If a cpu is hovering at 90-95C and you are aware that the shutdown will occur at 100C then you should be concerned and take action to control the temp better. It does not take much to make the jump from 95C to 100C (easily less than a second) with a CPU that is heavily loaded.

I found the temperature@fevimu applet. Search applets for it. It displays CPU temperature in C or F in the panel.

The CPU was running extremely hot while running YouTube. One time the machine completely shutdown. I finally inspected the fan of my Dell Inspiron 1520 laptop. No dirt and the exhaust fins of the heat exchanger were sparkling clean. I never removed the heat exchanger from the CPU. Funny thing is that when I reassembled the laptop after looking for dirt it ran significantly cooler.

Did you also blow the fins clean instead of just looking at them? If not then you should have.