I copied the material for this glass from a video but it’s not see through like the video. The top picture is mine the bottom is how it’s supposed to look. What did I do wrong?
The image is too small to check.
The node formation looks similar to the video. 
In the video, the basic color of a person’s material setting is black.
What render engine are you using? Post a bigger picture of your node setup.
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I just realized I had it in Eevee not cycles, switching fixed it. Thank you
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For Eevee to work, you need to turn on screen space reflection & refraction in he render tab and also set them in the material, as well as turning the alpha from opaque to alpha hashed.
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