Hiding specific window (Enhanced Command+H) Is there a way, native or third party tool, to hide a specific window instead of all Application Windows, which is the current behavior of all macOS versions. 

For example, when opening multiple Safari windows or Terminal windows, I just want to Command+H one of the windows, not all the application. 

This is really helpful for multi-monitor setups.
This may not be exactly what you are looking for but it is a start.

If you want to hide your current front most (active) window simply pressing ⌘ Command M will do that.

That is the keyboard equivalent of clicking the yellow "Minimize" window button. 

If you then need to "un-minimize" a window that you recently minimized that will require a trip to the mouse and the right size of the dock...