Hi
@Job76 , and welcome to the forum!
The 1 to 10 ratio is simply a starting point from which to work out your personal ratio. Some of us need as little as 1 unit for 20 grams of carbs, others need 1 unit for 2 grams of carbs.
To make things even more complicated, many of us have different ratio's throughout the day. For instance, I need over twice as much insulin for the same food in the morning than I need in the evening.
Take your time learning, it's a marathon, not a sprint!
Do you have regular contact with your diabetes nurse to speak of how food and insulin affect your blood sugar and how you could tweak your doses?
Good luck!