Wyjścia 18:8 Komentarz: Rashi, Ibn Ezra, Sforno & Or HaChaim

ויספר משה לחתנו AND MOSES RELATED TO HIS FATHER-IN-LAW [ALL THAT THE LORD HAD DONE] — in order to allure his heart that he might attach him to the Torah (Mekhilta).

2) Moshe explained to Yitro not only the final result (Yetziat Mitzrayim), but the challenges that the Jewish people face along the way.

את אשר עשה ה' לפרעה ולמצרים על אודות ישראל. A reference to G’d performing vengeance as the avenger of His people. Compare Deuteronomy 32,41 for similar syntax used by Moses. when he quotes G’d as saying אשיב נקם לצרי, “vengeance will I wreak on My foes.” This referred to the Egyptians experiencing G’d’s retribution on their own bodies when they drowned in the sea. In Psalms 78,49 the psalmist describes 4, resp. 5 stages of G’d’s anger which the Egyptians had to experience before they died. Tthat verse is the subject of detailed analysis in the Haggadah shel Pessach. These events proved that G’d had chosen the Jewish people as His most treasured possession among the nations.

את כל התלאה ALL THE TRAVAIL that they had experienced at the Red Sea, and that caused by Amalek (Mekhilta).