Applies to games of all sorts, from fighting games to investing in the stock market.

The wilingness to learn how the system works is directly proportional to the investement of the player. If a game requires 30 min of tutorial to get it going, many will drop of as the learning req...

Tutorials of products where you have to click or tap certain areas to advance are quite innefective. The game may be advancing but the user does not learn anything. 

A better approach is to give users challanges. Teach some systems but let the user fill in the gaps. These small achivements ...

The best games are simple games because you get fast feedback. A bad move in a fighting game is instantly punished, while in a long strategy game it may take hours. The faster one can experience the consequences of their action, the faster the learning curve.

Complex games...

Cut out words. Elements should be familiar and long walls of texts should be avoided. 

The user should learn by doing rtaher than by reading.