How do hexadecimal numbers or whatever work?

[Captain Maxx Power]

Hex is simple you just count liek this:
1234567890ABCDEF

Actually it's 0123456789ABCDEF. Hex is present because it's an organised way of representing groups of bits, specifically groups of four bits, since all zero's = 0 and all 1's are equal to F. If you had five bits it would have to go up to and past Z to represent it, and with three bits you need only go as far as 8 (which coincidentally there is a representation for in the form of Octagonal numbers which are Base-8).