When creating a buffer, around a point or polygon, projection matters. You'll have to reproject your layer into a frojection that is measured in feet or meters. As you can see in your projection details, your map units are degrees. If you make a buffer, your buffer will also be in degrees, or will fail to compute. For example, I reproject from WGS_84 to the State Plane projection (in feet or meters, depending on which unit I want to use to calculate my buffer) corresponding to my US State, create my buffer, then reproject the result back into EPSG 4326, WGS_84.
-- Nathan Broaddus GeoData Analyst NBT Solutions 207.747.2561 x105
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