The videos are focused on typical team play mistakes, which can be a cause of lost battles. The narrators illustrate widely-known basic guidelines with examples of specific situations. Just to name a few:
- Do not celebrate your victory before you actually win;
- Focus your fire;
- Know when to aim properly and when to move as fast as you can.
These videos will be interesting for beginners.
I guess, I should warn you that the narrators have Russian accent (Ukranian or else, I'm not good at this), so do not watch if it bothers you.
The 3rd one is a bit different. It features a full replay of a battle in tournament finals. The mistakes are explained starting at 7:24.