#1 The winning psychology
If you have not been keenly observing, every Premier League champion - be it the generations of players under Ferguson's United or the swagger-inducing talent of Guardiola or the tough-as-nuts champions of Mourinho's Chelsea and even the surprising champions of Ranieri's Leicester, a common theme that tied them all was their unshaken belief. All of them firmly believed that nothing could stop them from winning the league. So strong was their confidence in themselves that even the opponents feared their invincibility.
For instance, imagine a Manchester City squad traveling to Anfield this season versus last season. Unlike last season, City players would no longer brush this off as a tough challenge. Somewhere deep down, like everybody else, City would be worried about losing to this team. That's what winning psychology does to you.
Back when Leicester was on their way to winning the league, a handful of teams including a few big ones were already convinced that Leicester is bound to win the title. That entirely changed the way they approached a game against Leicester City. The opponents no longer believed they could get a victory out of Ranieri's foxes. They knew Leicester would chase down loose balls, and almost always get that winning goal.
Klopp has instilled that winning psychology in every Liverpool player. They are fearlessly passing the ball around, knowing that somewhere down the line they will win it.
The belief is finally back at Anfield that they can win any team anytime.