- Where on Mars did the NASA’s Perseverance rover collect these samples?

https://mars.nasa.gov/mars2020/mission/where-is-the-rover/

Zoomable map, here you can see the position of the rover, including the Sol dates of these collections.

Regolith is just like sand and dust and dirt right?

Like concrete. Mix it in the right way and it may last for thousands of years.

Depends on how you define "dirt." Regolith strictly has nothing biological in it, which some definitions of "dirt," include.

So sand and dust and other inorganic particulates.

Yeah; I guess it would be a real story if there was organic material.

It's to differentiate it from "soil," which is strictly biological in nature.