Actually, you do.
It's likely that you don't know the last thing. But the first?
You know enough to know you don't know everything.
You know enough to know that there might be a pitfall or a trap ahead, and that you need to tread carefully.
You know enough to reach out and ask for help.
That's three things, things that others less thoughtful than you don't know.
So, give yourself some credit and begin.