Dangerous Knowledge

well as most of u know my curiosity is for the most part uncontrollable.
I was sitting thinking to myself just “how big is infinity?” so I thought….lets see infinity
1-2-3-4-5-6-7-8-9-10 etc. I thought that was endless itself but then I said but wat about fractions if we add fractions that would make this “infinity” a lot bigger…lets just start between 2 numbers
1 & 2 we got 1½ between the two but even between the number 1 & the fraction there are fractions smaller & between those fractions there are even smaller fractions so its infinite but thats just between 1 & 2 so suddenly our infinity of “1-2-3-4-5-6-7-8-9-10 etc.” just got infinitely bigger
so I got on the internets & searched for something that might explain it to me…but I failed I came upon 2 videos & got sucked into them there about 88 mins (1:28hr.) long.
here is the link if u want to see both of em