He's probably referring to the Blitz, you know with the 100 days of bombing. (which is incorrect by the way. It lasted from the start of the Battle of Britain from September 1940 all the way to May 1941.)
The best thing to do is to go to wikipedia and read the Blitz off from that. Keep in mind that Wikipedia is great for quotes and very 'accurate' in comparison with other particular books whatever your history teacher might say.
The Blitz - Wikipedia, the free encyclopedia
Check your school and local library also and look for any books pertaining to the Battle of Britain. They should have references to your topic either in the borrowing section or reference section. I would be really surprised if they don't.
The Second World War by John Keegan also provides a good overview if I recall correctly but make sure you cross reference with his work and wikipedia. He can be incorrect sometimes since he is a more of a journalist than a historian in my mind.
not only 100 days of bombing. There are other key points as well such as the backwardness of the Polish Army (if you're doing the blitz as in that of Poland), its lack of modern equipment.
Alternatively if the talk is purely on the tactics developed for it then you must include the German employment of armoured formations, use of bombers as tactical air support e.g. how the Luftwaffe was superb in supporting the German army as well as how the Germans made extensive use of motorised infantry divisions.
And call it 'Vernichtungsgedanken' (the nifty name for this i.e the encirclement of the enemy as fast as possible in a pincer movement using the element of surprise, speed and the firepower of combined arms to eliminate and destroy the enemy, seen in Poland, France and Russia, before 1943) which was the fundamental principle of Blitzkrieg and which ironically the Russians used back on the Germans after the Battle of Stalingrad.
So basically in your 2 minute speech, refer to the invasion of Poland, follow it with a quick reference to the Phoney war, then refer to the Battle of France and the early successes of the Operaiton Babarossa and how the Russians used the same tactic back against them in Operation Uranus, Bagration etc. (I don't know any more than these two).