Deleting photos that you do not want to keep is a surprisingly complex process inside of Adobe Photoshop Lightroom Classic. Deleting mistakes and failures is a fundamental image management activity, and something that we should be doing all of the time, yet within this program the Delete versus Remove dialog window confuses many new Lightroom Classic users.
Even very experienced Adobe Photoshop Lightroom Classic users often get confused when they try to delete images from a Collection or a Smart Collection. It turns out that the type of Remove Photos command that you need to use changes based on which View Mode you are in. The Remove Photo command that makes the most sense also changes depending upon what Module you are in and the appropriate commands / keyboard shortcuts also change if you have multiple images selected.
There is even a Power Delete keyboard shortcut secret in this video that advanced users might find really helpful if you stick around all the way to the end of this lesson.