I haven't completed the course, but this looks like a good supported course to better understand insulin action. It is more healthcare professional facing, but of value to learn more.
This course launches today, so I have registered, but not fully completed it which can take up to 4 weeks. Registration with 'FutureLearn' is free and straightforward. The course consists of a series of articles, case studies and videos about insulin and also offers the opportunity to post comments and share learning experiences others and receive support from course tutors and learning mentors. The course is aimed primarily at healthcare professionals, clinicians, school nurses, healthcare workers etc, and covers insulin use in both T1 and T2 diabetes. There looks to be some good, if rather basic, information here for people and families living with type 1 diabetes, who are looking for an introduction to insulin and what it does.
Having skimmed through the curriculum, some of the information about the practical use of insulin day-to-day does seem a little thin on the ground. For example, I could not find any references to modern intensive insulin therapy, carbohydrate counting, insulin:carbohydrate ratios, correction factors etc. Neither did I see any mention of insulin pump therapy, CGM or Flash Glucose monitoring.