Torah Temimah citing Eruvin 21b: He taught Simanim (ways to remember things), reasons and analogies.

Rav Sadya Gaon: The advantage of Shlomo's Chachmah was that he did not cease to benefit people from it.

Rashi: His Chachmah was more than is written in this Sefer.

Ibn Ezra: "Od" teaches constantly, like "Od Tum'aso Bo" (Bamidbar 19:13).

Ibn Ezra (7:3): Some say that "Koheles" is like "Kehilas Yakov" (Devarim 33:4) - a collection of Chachamim wrote the Sefer; each said what he thought ¹ .

Rashbam: More than these Chachmos, he taught Chachmah orally, in order that people will know and grow wise.

Rid: Just like he was exceedingly Chacham, he taught people exceedingly. "Od" is like "va'Yevk Al Tzavaro Od" (Bereishis 46:29).

Seforno: Just like he was wiser than other Chachamim of his generation, he strived more than them to teach Da'as to the nation.

Metzudas David: In addition to being a bigger Chacham, he had another attribute - he taught others.

Rashi, mostly from Yevamos 21a: Before Shlomo, the Torah was like a basket without Oznayim (handles). Shlomo made handles for it. He enacted fences for guarding Shabbos, enacted Netilas Yadayim to guard Taharah, and decreed Sheniyos (Arayos mid'Rabanan), for a fence for Torah Arayos.

Rav Sadya Gaon: He was meticulous, fixed and established many matters.

Ibn Ezra #1: He composed songs, or compositions of Chachmah.

Ibn Ezra #2: Izen is like Oznayim; he made heard ¹ . Chiker is Po'el Yotzei Shelishi ² . He taught people ways to investigate Chachmah. "Va'Ydaber Sheloshes Alafim Mashal ³ " (Melachim I, 5:12).

Rashbam: He puts to his ears and heart to investigate worldly matters and Chachmos, and established Sefer Mishlei.

Rid, Metzudas David: He caused people to hear [Chachmah], he investigated, and "va'Ydaber Sheloshes Alafim Mashal."

Seforno: He taught people ways to investigate words of previous Chachamim.