When I set Windows up on mine, I could not see the Mac partition from it, nor read/write without extra paid software. The software works so smoothly I could not

When I set Windows up on mine, I could not see the Mac partition from it, nor read/write without extra paid software. The software works so smoothly I could not recall its name since I've never had to interact with it. (Having looked it up now, it's called MacDrive). I don't know how Windows-Linux, and Mac-Linux partition connections are visible between each other without similar pieces of software. I do know that Mac was able to see Windows just fine for reading, but writing anything was impossible.