And Solskjaer revealed he told the players to outwork their opponents.
"One of the things I talked about today is that a Manchester United team should never ever be outworked, doesn't matter what team you play, you should run more than them and then your skills will give you a chance of winning again,” he said.
"Yeah, I said the same to these lads as I do back home in Molde: 'Just work harder than them, enjoy yourselves, pass it forward, run forward, if you lose the ball I don't mind as long as you work to win it back', and they did.
"When you've got players like this with the quality they're always going to create chances.
"There's quite a few [positives]. The attitude and application of the boys when you go out there and see them, the attitude has been fantastic. The dressing room, the way they approached this game, because it's been a difficult week for everyone and to get the focus and perform as well as they did impressed.
"The players made me comfortable. Settling in quickly, you're excited when you meet new people but I know the club and I know the staff, I've had some great days now but the players have gone out there and [Marcus] Rash, he's got a great strike in him, that swirl is difficult for the 'keeper."
Man Utd news: Ole Gunnar Solskjaer has revealed his main instruction for the Cardiff game (Image: PA)
Ole Gunnar Solskjaer won his first game in charge of Manchester United (Image: PA)
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United won after goals from Marcus Rashford, Ander Herrera, Anthony Martial and a Jesse Lingard double.
It has set the wheels in motion for Solskjaer as he tries to recover the mess under Jose Mourinho.
“Football is easy if you've got good players,” Solskjaer said.
“They are a great bunch of players and their quality is unbelievable.
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"I arrived on Wednesday night and only had Thursday and Friday with the players.
“Wayne Rooney texted me and gave me some advice - so it must be down to him! He told me to make them play football, enjoy themselves and be Manchester United.
"The foundation was in the defending. I thought the two centre-backs and two full-backs were brilliant."