5x19 To Catch a Jedi

As suggested in Disney+ during Ahsoka release

Ordered according to canon timeline, as described in https://trakt.tv/users/sonicwarrior/lists/star-wars-canon-timeline, which in itself is based off of https://starwars.fandom.com/wiki/Timeline_of_canon_media

Ashoka's development

1. The Film (her very first appearance)
2. "Rising Malevolence" (first appearance in The Clone Wars; Season 1, Episode 2)
3. "Storm Over Ryloth" (The Clone Wars; Season 1, Episode 19)
4. Return to Geonosis (The Clone Wars; Season 2, Episodes 5-8)
5. "Lightsaber Lost" (The Clone Wars; Season 2, Episode 11)
6. "Padawan Lost" / "Wookiee Hunt" (The Clone Wars; Season 3, Episodes 21-22)
7. "A Friend in Need" (The Clone Wars; Season 4, Episode 14)
8. The Onderon Arc (The Clone Wars; Season 5, Episodes 2-5)
9. The Temple Bombing Arc (The Clone Wars; Season 5, Episodes 17-20)
10. The Martez Sisters (The Clone Wars; Season 7, Episodes 5-8)
11. The Siege of Mandalore (The Clone Wars; Season 7, Episodes 9-12)

the best/most important episodes of the clone wars in chronological order

revenge of the sith/siege of mandalore timeline:
https://thedirect.com/article/star-wars-the-clone-wars-a-timeline-of-how-the-final-arc-coincides-with-revenge-of-the-sith

simplified version:
https://dorksideoftheforce.com/2020/05/11/star-wars-mandalore-episode-iii/amp/