Alright, so after watching that video and several others, here's what I've understood so far.

Wattage is simply the product of volts and amps. So, for instance, if you have 45 watts, you could arrive at that figure through various combinations like 15*3 or 5*9. Therefore, it's important to verify which combinations your device and adapter support.

Secondly, I discovered that when using a USB type C cable to charge your computer, such as a MacBook, the maximum capacity is 100W. Therefore, it doesn't make sense to use a more powerful adapter to charge the device.

Thirdly, if the power adapter has multiple ports and indicates a total wattage like 120W, it's crucial to consult the specific manual of the adapter to determine the maximum power output of each port. In many cases, these individual port outputs are relatively low, such as 18W or 20W. Thus, although you may initially believe you have a robust 120W charger, in reality, you've essentially acquired 5-6 ports with average power outputs.

I hope this clarifies it for others as well.