A family of Microsoft word processing software products for creating web, email, and print documents.
You don't have to buy new software because support ends. It just means you don't get updates and new features.
You might take a look at LibreOffice, which is open-source, free and has good Office file compatibility.
For long-term user of older systems, Windows is much better than macOS. Apple updates macOS every year and most software companies only support the three most recent versions of macOS. After about 10 years, Apple drops support and it becomes difficult to impossible to update a Mac. By comparison, under Windows 11, I can run both current editions and software I bought 20 years ago.
Little known fact, you can install Windows 10 and 11 without a product key, thus avoiding payment. These systems are completely useable, though the ability to personalize the interface is limited.