Answer:
Basically, the author is talking about how there are many different yet often equal paths in life, some that have been take before and other that have never been "walked on' or, as the author writes, "trodden black". You can only take one path that might not be clear (as, in this case, it is covered in leaves) that leads on to other paths that you must also choose from along the way. This stanza, taken from the poem "Road Not Taken" that Robert Frost wrote, is a representation of moving on to the next step - or path - in life.
I hope this helps you.