Tool/Software to Change Screen Brightness

As said, is there any easy way to change screen brightness without touching the hardware?

To add: I like to adjust the brightness easily when I switch from working to watching videos. I used to be able to do that in Win7 previously (there is a small utility software that does the exact thing).

Yeah, on linux things work differently.
Here is all you need to know about how to get it woking Backlight - ArchWiki

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