This is why testing helps: anyone can say about anything on the internet, in print or in some course or other, but your meter will only tell you what is true for you, personally. When I started this journey I read very shouty books that told me I'd better do what they said, or I was practically dead already. Stumbled across Dr. Jason Fung, who took a far less militant approach, to put it mildly, but then I still had to figure out what worked for ME. Same as you'll have to do. Work out what works for you, take the time to. Use that meter, see what's effective for your metabolism and lifestyle, and what's absolute rubbish. Because there is indeed a lot of rubbish out there.
Take everything you read with a grain of salt, experiment when you think something sounds plausible, and put your trust in your meter. Unless the strips are out of date, it's not likely to steer you wrong.

You've got this.
Jo