The Conclusion of the Matter

9 Not only was the Teacher wise, but he also imparted knowledge to the people. He pondered and searched out and set in order many proverbs.

Read Ecclesiastes 12:9 Using Other Translations

And moreover, because the preacher was wise, he still taught the people knowledge; yea, he gave good heed, and sought out, and set in order many proverbs.
Besides being wise, the Preacher also taught the people knowledge, weighing and studying and arranging many proverbs with great care.
Keep this in mind: The Teacher was considered wise, and he taught the people everything he knew. He listened carefully to many proverbs, studying and classifying them.