Accessing Linux Directories in WSL From Explorer

Directories in WSL can be accessed by navigating to your distribution and filesystem after opening \\wsl$ in File Explorer.

Dude, how do I pin my folder for Quick Access?

By default, File Explorer opens to Quick Access. This contains a whole bunch of stuff (folders) as well as stuff that has been "pinned" to Quick Access.  Any folder of interest can be "pinned to quick access" using a simple right click. A pinned folder can be easily "unpinned" using the self-same right click action.