On the Cave of the Nymphs in the Thirteenth Book of the Odyssey

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. 1. What does Homer obscurely signify by the cave in Ithaca, which he describes in the following verses?

"High at the head a branching olive grows
And crowns the pointed cliffs with shady boughs.
A caver...