Gareth Southgate believes his England players got a glimpse of what their potential might be as they came from behind to beat Belgium in the Nations League on Sunday.
The Three Lions recovered from a slow start in London to secure a 2-1 victory and move top of Group A2.
Nations League holders Portugal drew 0-0 at world champions France in Group A3 while Italy were also held goalless in Poland in Group A1.
Denmark won 3-0 in Iceland with Christian Eriksen among the goals.
In League B, the Czech Republic shrugged off the loss of players due to coronavirus with a 2-1 win in Israel, Matej Vydra sealing the win early in the second half. But Scotland sit top of Group 2 after beating Slovakia 1-0.
Group 3 leaders Russia drew 1-1 with Turkey as Serbia lost 1-0 at home to Hungary. Austria prevailed 1-0 in Northern Ireland in Group 1.
C3 leaders Greece beat Moldova 2-0 in Athens while Kosovo lost 1-0 at home to Slovenia in the other group encounter.
At Wembley, Romelu Lukaku gave the visitors the lead from the penalty spot after being felled by Eric Dier, after Yannick Carrasco had already had an effort ruled out for offside.
But England went in level at the break as Marcus Rashford converted a spot-kick of his own.
Mason Mount then hit a deflected winner as England beat the team ranked No.1 in the world for the first time since 2011.
With captain Harry Kane only fit enough for the bench and Raheem Sterling out injured, Southgate fielded a number of his younger stars and feels the experience of beating a side like Belgium will hold them in good stead.
"I think tonight you saw the top-level game where we were able to use the ball well, create chances," he said.
"You don't get many chances in this level of game, but we did create chances. But defensively you have got to be spot on. You can't be loose in anyway shape or form.
"The players really took that on board."
Kane came on for the final third of the game and missed a fine chance to wrap up the win, but Southgate is hoping the minutes help him in his fight to be fit for Wednesday's Nations League game with Denmark.
France and Portugal were involved in a cagey clash between the world and European champions which largely failed to live up to its billing.
The teams could only manage one shot on target in the first half, a hopeful attempt by Antoine Griezmann from the tightest of angles which stung the hands of keeper Rui Patricio.
Cristiano Ronaldo came closest to scoring when he fired a left-footed strike at goal in added time but his deflected shot was well saved by France goalkeeper Hugo Lloris.
Ronaldo also nearly scored in the first half but France defender Lucas Hernandez produced an excellent sliding block.
Portugal defender Pepe looked to have finally broken the deadlock late on when he placed a diving header in the net following a free kick but he was ruled offside.
Italy's draw against Poland kept them top of their group after the Netherlands drew by the same score against Bosnia-Herzegovina.
The match was supposed to pit two of Europe's top goalscorers against each other in Robert Lewandowski and Ciro Immobile.
However, Italy coach Roberto Mancini surprisingly left Immobile on the bench.
Poland almost scored late on. Italy defender Francesco Acerbi did well to deflect Grzegorz Krychowiak's effort narrowly past the left post.
Federico Chiesa had Italy's best chance early in the match, but he fired his close-range effort wide.