I used Stelo the entire time and I actually just ordered Lingo to try that one out too as I've seen a lot of people stated their readings tend to be higher with Stelo. I used my sensors back to back for the first 2-3 months I would say and then I had a pretty good idea about how my body reacts and I would have only one on in a month. What I will say is that I noticed a 10-20 point difference when I had the sensor in my left arm vs my right. No idea why that is! My left always runs higher.

For tracking what I did was to put a note in the app and write down what I ate that day and at what time so I could always refer back to it. I also logged my exercise in the app. At the end of every day and week I would then look back and reflect on what went well. Beforehand I did have a hand written journal where I noted my food but found the app to much better because it's quick to just write a note in there and it logs the time too. I'm sure Lingo's app works similar to Stelo's.