Conversation so far:
What is the significance of Jonah in judaism?
The Book of Jonah is read every year, in its original Hebrew and in its entirety, on Yom Kippur - the Day of Atonement.
Why is this important?
as the Haftarah at the afternoon mincha prayer.
How else is Jonah importnat?
Teshuva - the ability to repent and be forgiven by God - is a prominent idea in Jewish thought.
This concept is developed in the Book of Jonah.

Question: Is this relevant to other teachings?
Self-contained rewrite: Is Teshuva relevant to other teachings by Jonah?