5 Things We Learned from Wednesday's UCL Action.

The second night of the new Champions League season was less tumultuous than the first, but there were still plenty of discussion points.

These are the best among them.

Inter demonstrates their class versus City.

In the previous 41 Champions League games at the Etihad Stadium, only one visitor team had kept a clean sheet, but Inter did just that tonight.

The Serie A winners defended admirably throughout, limiting Erling Haaland to only one serious chance and appearing mostly at ease in the process.

That is not to argue that the three-time European Cup winners lacked opportunities. Inter created some fantastic opportunities, both in general play and in some deadly counterattacks. Marcus Thuram and Matteo Darmian should have done better in front of the goal.

Simone Inzaghi's brave decision to sit captain Lautoro Martínez proved successful, with Nicolò Barella relishing the opportunity to test himself against Rodri and company.

Inter's performance and result should not have surprised anyone, especially Pep Guardiola, given how close they came to beating City in the 2023 final.

Based on tonight's performance, they are very much a contender again, and unquestionably the finest Italy has to offer.

Celtic in total paradise.

Celtic Park is usually referred to as Paradise, and tonight it more than lived up to that name, as the Hoops had a European night to equal any in recent memory.

Their 5-1 victory over Slovan Bratislava was their best win and first Champions League opener since 1992.

Liam Scales got the Scottish champions off to a great start, smashing a header home after 17 minutes, but it was after the half that they ran wild, providing their fans (including Rod Stewart) with a rare, fairly stress-free European night.

Brendan Rodgers, who won only his fourth game of 25 in the tournament tonight, stated in the build-up to the game that he felt this was the best time for the club to take a serious go at Europe, and based on tonight's performance, he was not wrong.

There will be bigger tests ahead, but with a somewhat favorable draw and Arne Engels and Kyogo at ease at this level, the 1967 victors could have a memorable season.

Ireland's thirteen-year wait is over.

It was a historic night in Glasgow, with Ireland finally scoring in the Champions League after a 13-year drought.

Darron Gibson's shot past Manuel Neuer (then of Schalke) for Manchester United in an April 2011 semi-final was the last time a shade of green appeared on a score sheet in Europe's premier competition.

It was, and continues to be, a terrible indictment of the nation's recent decline, but it was a good night because two came in on the same night. Like Dublin busses, you could say.

As previously stated, Scales scored Celtic's opening goal, followed by Adam Idah, who scored the fifth and final goal of the night off the bench.

After a challenging international break, new manager Heimir Hallgrímsson and his team received a much-needed lift.

Mixed night for the new boys.

Bratislava's Champions League debut went horribly wrong, while some newcomers fared better.

Bologna may have been unhappy not to begin their season with a win at home, but Shakhtar Donetsk are never an easy opponent, and the Serie A club is still recuperating from the departures of manager Thiago Motta and important players Joshua Zirkzee and Riccardo Calafiori. A draw is something to work upon.

Girona was minutes away from securing a point away to PSG, but were left to rue Paulo Gazzaniga's error, which handed the Ligue 1 champions the victory.

The former Spurs goalie had been fantastic before then, as had the most of his teammates, who rarely had a chance of their own but defended admirably, giving them hope for the rest of the "league phase."

Brest will make their bow tomorrow. How will they fare?

Could the new model work?

The first night of the Champions League felt familiar, with no surprises and a sense of inevitability throughout.

Tonight was an improvement, with no results close to Bayern Munich's 9-2 thrashing of Dinamo Zagreb and several heartwarming anecdotes.

Celtic won, although against a newcomer, while Sparta Prague surprised with a 3-0 victory over RB Salzburg, now coached by Jürgen Klopp's former assistant, Pep Lijnders.

It was the Czechs' first Champions League game in 19 years, and they now have a chance of at least making the knockout round play-offs, which is an improvement over their previous situation.

Tomorrow night marks the end of the first round of the new season; may it provide us with some more positive indicators from this new model?