My issue is that I have 2 objects in edit mode, I want to use the second object to cut the first one to make a hole.
I hope the image can make what I want a little clear because I don't find the right words to explain that.
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Use the Knife Project tool.
To use Knife Project, first while in Object Mode, select the “cutting object” then select the “object to be cut”. Now, enter Edit Mode and press Knife Project (found in the Mesh > Knife Project).
When you're done, just delete the "cutting object" and also any unwanted faces from the cut object.