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I have difficulty understanding the difference between these two phrases.

Does “touch (an item)” express a more general meaning — I mean, is it used when you do not specify the item? For example: “Touch a point (anywhere on the screen)”? Is “touch ON (an item)” used when the item is specified? For example: “Touch on the point (this point) on the screen.”?

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  • Screens are getting complicated. You do touch + something for a touchscreen whereas with a mouse you click + on + something. Then, just when you get these down, on come the 3D VR screens...
    – lurker
    Jan 21, 2016 at 6:30

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You don't touch on something, you touch something. The following sentence is correct.

Touch a point on the screen.

The only context I can think of where this rule would not apply is if you were referring to a speech that touched on a topic, but that doesn't have anything to do with physical touching.

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