The 1.c4 2.g3 English is a major opening system. It's too large to cover in any short course, so I am presenting just the most common lines that occur in the sequence when Black answers 1...e5.
The good news is that many of the lines where Black plays a move other than 1...e5 (1...Nf6, 1...g6, 1...d6) often transpose into lines in this course if they soon play an early ...e7-e5 anyway.
Play pawn to c4.