Once the process is complete you'll be able to launch DOSBox-X, point to your Windows 98 configuration file, and boot right into Windows 98.
Lastly, you can install some games or other apps and use your modern Windows, macOS, or Linux computer like an old beige box from the 90s. This process involves configuring DOSBox-X to mimic the hardware found in a Windows PC from the late 1990s, creating a virtual disk on which to install Windows 98, following the setup procedure, then finalizing the procedure to install drivers. You can play old PC games by installing a functioning version of Windows 98 with DOSBox-X.
How to Play Old PC Games on Modern Platforms