The Missoula Nordic Ski Club demonstrates the three basic techniques of skate skiing:
V1 (or "offset" skating) it's like first gear/a low gear for starting or going uphill
V2 Alternate (aka "open field") it's like a high gear for high speeds on flats and downhills
and V2 a medium gear for accelerating, flats and gradual uphills.
More technique videos
Overview of All Three Techniques: • Three Basic Skate Ski Techniques Expl...
V1: • Basic Skate Ski Technique: V1/Offset
V2 Alternate: • Basic Skate Ski Technique: V2 Alterna...
V2: • Basic Skate Ski Technique: V2
Filmed in the Methow Valley.