You can run just about anything compatible with Windows 7 Windows 10. In terms of the software architecture, they're very similar. If you try to run a Win7 game on Win10 and it doesn't work, you can try running Windows Compatibility mode. Here's how.
Right click on the game launcher and select "properties" and you should see something like this (I'm using Black Desert Online as an exaple, but isn't actully necessery to do this with this game, it works on Windows 10 just fine)
I've highlighted the "compatibility tab. Click on that and you should see this;
The compatibility troubleshooter is what it sounds like and can to detect if a program or game has a compatibility problem with Windows 10. The highlighted areas are a check box and drop down menu that allow to run a program as is the OS was an earlier version of Windows, like Windows 7. If you need to, make the selection the OS you want, hit "Apply" then try running the game again.
Some games have problems running on more modern hardware (Fallout 3 comes to mind, or my nightmares), but solutions to that are usefully indigenous to the games themselves
Hope that helps.