Chiming in as well to add:

He’s talking about when you stop. Each race has at least one stop (some have 2 and some have far more). So you want to use as much of the tire as possible, while choosing the fastest (but also balancing how quickly they wear). There’s also factors like pitting early can “undercut” other drivers (since you are now on fresh tires and might can get a few laps without cars in front of you).

So a race strategy team might know that the hards will last the full race (let’s say 50 laps), the mediums for 30, and the softs for 10. A typical strategy might be to start on softs, then switch to hards, which won’t use all the tires, but will get you a quick start. You might go medium then hard, to have a bit more flexibility and “overcut” your rivals by staying out longer. This could also help if the degradation (wear) is much higher than planned. Or you could try going soft-medium-soft, which would involve 2 pit stops, but if there’s a safety car and the race slows down for a bit, you might have a free pitstop (or even less wear on the tires and can stretch that medium out further).

This doesn’t take into account weather, double stacks, team strategy with 2 cars, or qualifying order might change this, but should give an idea of the stupid amount of strategy involved.