Two Skate is also known as Gear 4 or V2 Alternate skating.
In Canada, its called Two Skate because the skier poles on every second leg push.
Beginners tend to ski with this timing naturally. So, in terms of the timing, it’s not hard to master two skate, but to do it properly takes considerable balance and coordination.
Two Skate is a high speed technique. Try using it more and free skate less.