As @Smurf2 said, when in doubt, print it and fold it up to see. With this one, you might want to cut it out from a piece of card stock that approximates the weight of the stock that will be used. Sometimes, templates need to be adjusted just a little to accommodate the thickness of the stock being used.
It’s not entirely obvious, but if any of those flaps are to be glued, make sure there’s no printing on the spots that need to be glued together. Assuming this is a real job that will be sent off to a printer/fabricator, be sure to specify that you want the folds scored before folding (makes the fold cleaner and helps prevent cracking). A printer should know enough to do that anyway, but since it’s an extra step for them, I’ve had a job or two where they’ve failed to do it, so I always include it with the specs.
I’m not sure what you’re confused about, though. It looks like a pre-made template, so why are you doubting it? This sort of thing gets more problematic when one need to create artwork from scratch for custom packaging. In those instances, it’s critical to really think through the problem and cut out some mockups to make sure it works.
One last thing? Are you certain that this is the type of box lid you need? It’s one of those double-walled lids that creates a tight seal around the box. There’s nothing wrong with that — I’m just pointing out that there are other types of box lids. There’s also the box itself. Every box lid needs a box, and that lid needs to fit perfectly on the box, which, once again, might require some small adjustments to accommodate card stock weight/thickness.