When starting a brand new log entry, there are many different options available to help you enter data about that particular point in time regarding your diabetes. Each entry allows you to add things like:
Entry Type
Location
Nutrition tags
Activity entry
Tags
Insulin Long-Acting
Activity description
Blood glucose
Bolus (Food)
Steps
Meal entry
Bolus (Corr)
Notes
Meal description
Temp Basal
Blood pressure
Pictures
Pills
Weight
HbA1c
Ketones
These entries can help you to put more context to what was happening at that time so that you can get a clearer understanding of how that moment may have affected your glucose levels. The more you add, the more context there is, and it makes it easier to remember later.
Make sure to add as much as you can. For instance, here's an example logbook:
