Day #2: Cannot Apply Shell to Beer Bottle in Fusion 360
Day #1 Beer Bottle Tutorial: You're trying to Shell the beer bottle but it will not let you select the body.
The solid modeling Revolve command should be used when creating the beer bottle. Solid modeling tools are indicated with blue icons and result in solid 3-dimensional bodies.
Check the icon in your parametric timeline. An orange icon indicates a surface modeling tool. Right-click on the feature and select > delete. Repeat the Revolve with the solid modeling command (blue icon).