We won for the simple reason that we were tactically superior and Lennon's approach was one dimensional. It was inevitable that they would try to blitz us with incessant pace and attack. Conte knew that, and equally inevitable was the fact they would tire.
So we set up to soak it up. And wait, and wait, and wait for the inevitable tiring of legs and the inevitable mistakes. The first goal was a gift, and to be fair to Celtic it didn't dishearten them much.
But indeed, as the hour mark came around, more mistakes were made and we pounced and took our chances. We were clinical and precise in both our defending, midfield play (most of the time) and finishing. We looked for the right opportunities at the right times, broke from midfield and capitalised on the errors we had predicted would come.
Perfect tactically. Celtic friends I've seen have been making comments Celtic "didn't deserve" to lose 3-0. They did. Because their tactics were basic, naive and one dimensional.
Celtic's "amazing" performance came from one angle and one angle only - fast pace blitzing. A better tactician than Lennon would come up with something different and would realise that after 60 minutes of that, you'd be taking a huge risk and leaving yourself hugely exposed to making tired mistakes - exactly as happened for the 2nd and 3rd goals