Option-Click to close is a novelty to me and a very handy one at that... the number of times I’ve accidentally shot myself in the foot by selecting and accident

Option-Click to close is a novelty to me and a very handy one at that... the number of times I’ve accidentally shot myself in the foot by selecting and accidentally opening maybe hundreds of folders is not something I’ve kept count of, but it’s definitely happened multiple times. I’ve been using OS X (now macOS) intensively since 2002 and I’ve come to think of myself as a “Power User”, but I’ve never known of the option-close trick. Thanks.