The book of Mishlei contains deep wisdom with many layers of meaning which is often hard to grasp. Fortunately, such great commentators as Rashi provide clear explanations of the true meaning. However, this time, even Rashi didn't help me.
In Mishlei 9:10 we read:
תְּחִלַּת חָכְמָה יִרְאַת יְהוָה וְדַעַת קְדֹשִׁים בִּינָה׃
[Chabad Translation] The beginning of wisdom is the fear of the Lord, and the knowledge of the holy ones is understanding, Praise of Him is everlasting.
תחלת חכמה יראת ה': היא עיקר הבינה:
The beginning of wisdom ... and the knowledge of the holy ones: is the root of understanding.
I don't understand this commentary at all and the following questions arise:
Knowledge and understanding are not the same thing. So how can "knowledge of the holy ones" be "understanding"?
Are "the holy ones" in this verse angels?
So what's the correct meaning of the proverb in a simple language for us mere mortals?