Youve come to the right place @Vic0628, dont let the info nerds scare you (of which I am as well).
Blood meter can be off as much as 20%. So what was said about 84 to 124 would be accurate enough. The best thing to do is take a lot of readings spaced about an hour apart. Yes, this will use up a lot of test strips, but it allows you to see the trends, and what is driving them.
The best advice I got was to keep a food log of EXACTLY what I ate and how much. A food scale to weigh the food in grams helps tremendously. All i did in the beginning was log the food, so i could see what was happening based on what food. This worked out really well. I discovered sugar free metamucil, labeled as safe for diabetics, is NOT SAFE FOR DIABETICS, it may be killing them. My BG would hit near 200 after havine a glasd. Turns out the main ingredient is maltodextrose. Which raises blood sugar more than table sugar. Yep, probably would have been better tobuse the sugar version.
If your test strips are to expensive, try the store brand meter (i have a second meter from CVS, a box of 50 strips is $13. Compared to my other meter at $1 a strip.
As inacuate as the testing is, it does allow to see sudden swings and track trends. Thats all you really need to do.
Other things than food can cause BG to rise as well. Stress will do it. Stress releases cortisol, which causes BG to rise. Im not sure if its locally souced sugar, from tissues, or created in the liver on the fly as you begin to stress. Either was, it creattes high BG, which causes INSULIN to rise. Insulin being a big bad guy in this case seeing as it is the FAT STORING hormone.
I highly recommend Dr Jason Fungs book, The Obesity Code.
Keep calm, keto on.
And Always,
Keto Vitae!