How do i pick up a gameobject?

Someone knows? For example i have a gun on the ground:
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when i come close to it and for example if i press a button lets say R i will pick it up:
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and the hand and the gun comes up as with the crosshair in the middle.
Is there any tutorials? How do i make this :frowning:

Regards-
Stian

I found this with google and these words : “unity pick up object”

HERE and THERE