Suppose you have 10 apples that you need to distribute to 5 people. how many apples will each person get?Answer is 2. Which is actually 10/5. You have taken 10 apples and divided it among 5 people. Hence each gets 2.
Similarly 1/1 means the no. of apples 1 person will get when 1 apples is distributed among 1 people. Hence answer is 1.
So, now we come to our problem of 0/0. If there are no apples and no people to divide these apples ,how many apples will each person (who is not there) get! This does not make sense right?? because this is what 0/0 mean . So 0÷0 has no meaning. Hope you understood this answers.