How to see hidden files on macOS

Once, a friend gave me a flash drive with documents that he wrote down on a MacBook and I connected it to a computer with a Windows operating system and it turned out that the flash drive contained a lot of other information that my friend deleted on MacOS but didn’t empty the trash, and in this case the files simply moved to a hidden folder.
Therefore, it is sometimes useful to see hidden files on MacOS.

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BDCOM. Solution Error: GPON0/1 allocId 256 has been used.

Once I deleted one ONU and typed it saved the configuration on the BDCOM GP3600-08B with firmware 10.3.0D Build 65417, but after connecting new ONUs, the onu-config-template auto-registration template stopped applying to them and the following error was displayed:

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