Hidden files
To always show hidden files in Finder on MacOS.
Terminal
Run the following command in your Terminal:
defaults write com.apple.finder AppleShowAllFiles TRUE
Afterwards type in Terminal:
killal Finder
This shuts down and relaunches finder with this new setting enabled. Now you see them dotfiles!
Finder
To quickly toggle hidden folders on or off while in Finder, you can use the keyboard shortcut:
Cmd + Shift + .