It takes a lot of effort to count your calories, thus, if you intend to do so for a few days (or more), you should have a good reason why.
If you’re simply curious to know how many calories you eat in one day, that’s more than good enough.
But to do so with no real goal in mind at all, or no real understanding of what a calorie is, or what the difference is between various kinds of calories, combinations of calories, timing of those calories, plus how all of that and more weaves into everything else you do all day & night, then, I’m not so sure how important it is to track.
So when you pick up a bag of chips that reads ‘just 100 calories!’ …
… don’t jump to the conclusion that it’s good for you.
One has nothing to do with the other.