Hello EMILY08 and welcome to the forum!
Very briefly, Type 2 diabetes ( often abbreviated to T2D on this forum) is the inability of the body to process carbohydrates properly, which means that glucose is unable to get into the cells, and accumulates in the blood instead, and it is this accumulation of glucose that causes the problems we call diabetes
All carbohydrates are made up from chains of glucose molecules, and as they are digested the glucose eventually builds up in the blood, as described
Thus to control diabetes you should reduce the amount of carbohydrate and sugars that you consume
This might sound terrible and difficult at first, but you soon adapt by substituting more salads, vegetables, and various other tricks & combinations.
I suggest you look at a few Sections -
The Home Page of Diabetes UK has a section 'Living With Diabetes'; click on that, and there is loads of information
Learning Zone - the red/orange box at the top of this page
Read previous Posts & Threads under Newbie; Food & Carbs; and if necessary, Weight Loss. Most of your questions will have been asked & answered before, and you will pick up more information and understanding
Finally, why not tell us a bit about yourself, like how you came to be diagnosed, any test results, your likes & dislikes on food, and if you wish, your weight, medication, and age, which will help us with advice and comments
Alright, here's another Final, with some reassurance -
No-one is happy about having D, and it may be a shock and a worry, but it's not a complete disaster
You can live well with D if you take steps to control & manage it, in fact some people say they feel better with D than they did before, but it does mean being careful, and accepting and sticking to any changes