Sometimes you need to edit a system file, or look at a file created by one of your programs. Many of these files are hidden by default, so you’ll need to make them visible before you can go about your business. One example I often encounter is hosts files, either for SSH or for your computer’s whitelisted and blacklisted domains, though there are many others.
"A quicker way to toggle hidden files on macOS, no Terminal required" is an article by iDownloadBlog.com.
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