Today I learned macOS has a built-in toggle for hidden files. In Finder or any Open/Save dialog, press Cmd+Shift+peroid. Dotfiles and hidden folders show up semi-transparent so you know they're normally hidden.
I've been opening Terminal and running ls -la to find stuff for years. Also found that Cmd+Shift+G lets you type any path like ~/Library directly. Any other Finder shortcuts Im missing?