In the last few years, Valve (company behind the popular Steam PC games store) has made huuuge efforts in making most games work well on Linux, because the Steam Deck console that they sell runs on Linux, and the compatibility layer they made is called Proton.
To check what games work well on Linux you should look in the ProtonDB.
If there are games that only work on Windows, you could do dual booting.
Pretty much, yeah.
I’d recommend using two physical drives (SSD/HDD) instead of two partitions if you can, because windows update sometimes messes with the bootloader. But most laptops only have one drive so that’s not always possible.
Do keep in mind that formatting a drive (e.g. to split it in partitions) will erase all the data, so make sure you have backups!