Gabon forward Aubameyang had helped the Gunners win a record 14th FA Cup against Chelsea earlier this month and produced a superb strike to give Arsenal an early lead against the Premier League champions.
The 18-year-old played on the right side of attack against Liverpool, but the majority of his fine displays last season were at left-back.
Pierre-Emerick Aubameyang scored a stunning curling strike for Arsenal against Liverpool in the Community Shield.
In the shoot-out, Liverpool's young striker Rhian Brewster was the only player to miss, hitting the bar with their third penalty before Aubameyang calmly dispatched the decisive spot-kick.
Ainsley Maitland-Niles, who was named Man of the Match on Saturday, has been linked with a move to Wolves, but said after the game at Wembley: "I'm an Arsenal player until I'm told otherwise and my heart's in the club".
The Gabon worldwide, who scored both of his team's goals in that FA Cup triumph over Chelsea, is crucial to the north London side and Arteta believes the club will have good news for anxious fans soon.
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Winning the Premier League has not quelled Liverpool's hunger for silverware and the Reds will continue to push for trophies in the new season, captain Jordan Henderson has said.
After only one week of pre-season training, it was a more encouraging result for Arteta, whose team emulated their FA Cup final win over Chelsea with another determined, tactically astute display. "It took a while until we got any schedule but since we've known it we've accepted it 100 per cent".
"I'm happy with what we have but we look constantly for improvement - internally too".
"Saka had a very good season with Arsenal, he wasn't in the team at the very end but it was a really good season of progress and he's a player watching very closely".
Takumi Minamino levelled the scores in the second half, and the game went straight to penalties at full-time. But we didn't do that and the shootout is always a lottery. "When you don't finish it off it's not enough and today it was not enough". "We respect the competition".