When you count up to ten you start at 1 and keep going until you reach 9 After that it is "1 in the tens column and start again in the units column". You don't put 10 in the units column, once you go over 9 units, you have one ten.
If you are counting in units of less than one, it is 0.1, 0.2 . . . . 0.9, then 1.0
The minutes and seconds of the hour between midnight and 1 am go from "no hours, no minutes and one second" after the zero of midnight.
There is no 24 - it starts again at zero. Yes, there are 24 hours in a day, but that is the length of time in a day , not the number of hours a specific time is from the day-change point (midnight).