It's becoming increasingly difficult to use this old 2008 MacBook Pro online as it's a 2008 model and can't run any OS newer than macOS 11 El Capitan.
A friend has a similar Mac running Ventura via the open Core Legacy Patcher and his Mac has Apple's theoretical RAM limit of 4 GB installed. However, it's possible to use 6 GB, I know because this Mac has that much.