If you’re just worried about your computer or whatever getting stolen, whole partition encryption at rest is the way to go.
That process also requires that you log out of or turn off your computer when not using it. Not everyone understands that part. If your computer is on and logged in when it gets stolen then someone could just not turn it off or log out and read all the data.
Of course that’s assuming you mean stolen by a criminal as opposed to confiscated. That’s a different thing altogether.