It is difficult to tell when and who discovered or invented the concept of zero but whenever it was done it was a great asset to the mathematics subject. It facilitated the end of the number sequence in the sense that for example in the decimal system after 0, 1, 2, 3 ... 8, 9 there was no new symbol, and thereafter a combination of earlier symbols starting as 1 0, 11, ... created the subsequent number. Similarly in the octal system, we have only 0, 1, 2, ... 5, 6, and 7 and the next number is 10 whose value is 8 in the decimal system.
So any sequence of numbers is possible and the next number will be a combination starting with 10.
In binary, we have only two symbols 0 and 1 and the next numbers are 10, 11, 100, 101, and so on.
That is the importance of 0 and many stories and theories are there for taking credit for discovering it.
Knowledge is power.