Here are some keyboard shortcuts and usage tricks in Windows Explorer that I find useful:
Alt + Left: Jump back to previously open path. Use this repeatedly to walk back through previously open directories.
Alt + Up: Open parent directory. Use this repeatedly to move up in the directory hierarchy.
Ctrl + Lor
Alt + D: Jump to address bar and highlight the current path displayed there.
Ctrl + Shift + N: Create a new subdirectory (or folder) in the currently open directory.