WiFi has 20 MHz channel. So, channel 1 has frequencies 2400-2420MHz.
Now for simplicity sake, let's just say we have an 8Hz channel. So, we have frequencies 1-8Hz or in other words we have 8 different frequencies in that channel for data transmission.
1Hz has one cycle, 2Hz has two cycles, 3Hz has three cycles and so on. With each frequency has its own cycle, how they are combined together as a channel for data transmission?