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issue with collision types

i am making a simple game in blueprints and am a complete beginner. i am playing with the preset first person shooter mode and have the code for when the cube is shot at it explodes but this also happens when i run into the cube (the first image).In the second image i want to be able for the cube to distinguish between me or a wall and a projectile but i cant drag the get object collision type into the enum query.
Any help would be greatly appreciated, Thank you.
(I am a complete begginer and know practically nothing about ue4 thanks)