Within the last few days I and most of the world got the message that "As of January, 2020, Microsoft will no longer support Windows 7." followed by a suggestion that I back up my computer. What does it really mean if my Windows 7 is "No longer supported?" Please be aware that simply asking this suggests a significant ignorance of computer technology. I am much dumber than that.
Mostly it means no more security updates after January 2020.
That means Microsoft won't make any attempt to patch any new security vulnerabilities that are found in Windows 7 after that date.
Not that they've been doing the best job of that anyway.https://www.bleepingcomputer.com/ne...pened-bigger-security-hole-on-windows-7/
As Draclvr has said, you can still use the computer offline. However if you use it online you'll be at increased risk of virus or other malware.
If you have games that require online activation or installation (such as those from Big Fish), you have the option of temporarily putting the Windows 7 computer online long enough to activate, and disconnecting it once activation completes, crossing your fingers that no bad stuff gets in. You shouldn't browse the Internet with the computer unless you are someone who knows how to lock it down and turn off unnecessary services. It doesn't sound like you're in that category.
Most games and other software will still work on Windows 7. It's in the best interest of developers and publishers not to suddenly lock out people who still use Windows 7 when they want to sell them games. Eventually there may be new releases of games that only work on Windows 10, or may not be "supported" if you have a technical problem. That won't happen immediately though. Think about how many years new games were able to be played on Windows XP despite Microsoft supposedly no longer supporting it. Most developers won't want to drop support of Windows 7 unless they want to use a new game engine that doesn't work on Windows 7.
Depending on the age and specs of your computer, you may be better off buying a new one rather than trying to install Windows 10 on the old one.