I could see ~/Library through Unix command in Mac, yet I cannot see it in a Finder window. I need to go as Finder -> Go to folder -> ~/Library, then I can find it. Does anyone know why is it like that? Thanks! It's macOS Big Sur.
Yes, that folder is hidden by default along with another bunch of files and folders becasue most users never need or want to go into it.
To make it visible press:
That's Shift-Command-Period, it will reveal all the hidden files. There is also a command to un-hide just the ~/Library folder:
chflags nohidden ~/Library