Ben Harsh continues to teach Twilight Imperium the 4th Edition. This video covers the various game currencies and the first section of the game play Phases.
Rules Corrections - Validated By Rules Reference
Corrections for 3:49
5.2 A player cannot activate a system that already contains one of his command tokens.
5.3 A player can activate a system that contains command tokens that match other players factions.
Corrections for 14:14
You do not pay a Command Token to use the secondary ability for the Leadership Strategy card.