0 divided by 0 has no answer because the answer does not exist.
If I gave you an apple pie and told you to divide it into 4 pieces, you could cut it up evenly and serve 4 friends. What if I asked you to cut up the pie to serve 0 people. You could not serve the pie. The answer is undefined.
With 0/0, you could try to argue that it is '1', since if the top and bottom are really small and the exact same number, it would be '1'
0.0000000000000000000001 /
0.0000000000000000000001 = 1
However, if the top number is 0, the answer will always be 0.
0 / 0.0000000000000000000001 = 0
Since there is no one answer based on an approximation limit of using the smallest number you can think of as an estimate, 0/0 is still undefined and has no answer.