Help your doctor help you
Beyond having the right tools, you should also have information about your health on hand. Basically, the more information you can give your doctor, the more information they can give you.
That means tracking your vitals like temperature, weight, and blood pressure. For those with hypertension, a daily log of your blood pressure can help your doctor determine how well your blood pressure is being maintained.
For the record, these are good things to have for an in-office visit as well. However, when your visit is remote, they become essential.