Full episodes from TLC
The full episodes that Warner Bros. Discovery, Inc. or its subsidiaries and affiliates posts free on TLC, its own YouTube channel, in the order their own titles number them. Each plays in YouTube's player, with YouTube's ads, loaded only when you press Play on its page.
Compilations, marathons and "best of"
Each as its own title calls it. They gather several episodes or parts of them, so they are not numbered with the episodes.