In many ways, the most important thing he does is lose the ball.
By which I mean, play with the confidence in his own ability to be willing to risk losing the ball, over and over again if necessary, in pursuit of decisive attacking passes. Lesser players want everything they do to be successful in order to impress. Fernandes understands that if he loses the ball ten times and assists two goals, he has done his job.
Not only that, but without losing the ball you force the opponent into an almost impenetrable defensive block that becomes very hard to score against. Of course, there are strategies that can work a way through those blocks. Guardiola is probably the foremost coach for devising and implementing those strategies in this generation of football. But it is in many ways simpler to just allow your opponent more possession of the football and a better balance of the territory. We all know this. We all understand that on the balance of counter-attacking vs possession-dominant football we do not want to be at the extreme end of the possession scale. What fans so rarely seem to acknowledge is that the only way to give your opponent a healthier balance of possession and territory, thus drawing them out and opening bigger spaces through which to attack, is to lose the ball, frequently. Klopp's glory days at Dortmund were a perfect example of this strategy: attack as directly and boldly as you can as soon as you get the ball. If you score, great. If you lose the ball, you allow the opponent to keep a positive shape and attitude to the game, leaving gaps for your next attempt on goal. It's a win-win.