How do i take screenshot on my note 20?

Volume down and side key at the same time. Can also enable palm/hand swipe across the screen, in settings.
 
Welcome to AC!
Can add a little more
Edge panel enable Tasker
S pen
Bixby
Google assistant
Accessibility menu short cut
 
You can also navigate into Good Lock > NavStar and choose your navigation buttons to include an icon for screenshots. I keep it in my ttay with nabigation buttons for quick and easy use.Screenshot_20220320-195431_NavStar.jpg
 
One more to add...

While on the screen you want to copy, pull out your Spen & select the Screen Write icon from the pop up menu bar. The program then will take a screenshot. A small toolbar will appear at the bottom of your screen. Select the download arrow in the toolbar which saves the shoot.

It's a few steps, but I like it. If I need to write on the screenshot, I can, then save it. If not, I just save it.

I love any opportunity to use my Spen.
Screenshot_20220326-021426_Samsung%20Internet.jpgScreenshot_20220326-021717_Samsung%20capture.jpg