Hi
@Holllly and welcome to the forum.
You seem to be making a good start.
The main practical purpose of a Blood Glucose monitor for us Type 2's is for eliminating foods that we react badly to.
This is required because we don't all react exactly the same way to the same carbohydrates. So an apple would be OK for many, but perhaps not a bowl of porridge. Where for others it might be the other way around.
The rule of thumb is that any meal where the BG reading 2hrs after first bite is more than 2.0 mmol higher than the reading just before eating is too rich in carbs and needs to be adjusted or avoided. This may mean reducing portions or by making lower carb substitutions
This uses up a lot of test strips at first, because things aren't the same at different times of day, or even at the same time on different days. So you need to test even the exact same meal several times in order to be sure of its effect. However many people eat pretty much the same breakfast every (or almost every) day. And mornings are often the time when we are most sensitive to carbs, so Breakfast probably gives you the best 'bang per buck' of testing.