I'm just learning myself, so others can explain in more detail. IMO means In My Opinion, and the 1.0 1.1 0.1 things relate the the sex of a type of snake. For example a 1.1 pair of corn snakes would mean one male (1.0) and one female (0.1). The 1st number is the number of males, the 2nd number is the number of females, and if there's a 3rd number it represents the number of unsexed snakes.
So say I have six baby corn snakes, 2 are male, three are female, and one has not been sexed. It would register as 2.3.1 on the number thingies. I hope this helps, I may not have explained it quite as well as other could have.