Chosen Solution
I recently found an iBook G4 and I put an Airport Card in it to connect to my home wifi. On the Network section there is a green dot next to AirPort. The Mac OS X is 10.3.9. Do I need to upgrade to Leopard before Safari will work? Or what else do I need to do?
You need to use a browser other than Safari. Most web servers these days use secure connections (https) which may be too advanced for Safari to comprehend. If you can upgrade to 10.4 then I’d recommend TenFourFox, otherwise look towards iCab (v4.9 is the latest that’ll run on 10.3).