How to turn on Chrome OS Developer Mode to get root access to your computer and add new features

The Chrome OS has a Developer Mode that gives you root access to the operating system of your Chromebook.
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How do open source OS 'SerenityOS' developers make a living?

SerenityOS '' that appeared in 2018 as an OS created from scratch rather than forked from an existing OS, make a living while developing open source projects? or publish the details. How I make a ...