In "What if...?" I learnt that you could have two timelines in one universe. Honestly, this only made me more confused with the MCU than I already am.
I don't know what is a timeline and what is a universe? What the TVA used to prune, a timeline or a universe?
When Loki escaped with the space stone, did he go to a different timeline or a universe?
When branching started at the end of "Loki", were they timelines or universes?
What events cause a timeline split and what cause an alternative universe?