so basically have a power pc g4 and i am wondering how to i upgrade it from os x 10.4.11 to os x 10.9.1?

You can't. You need an Intel Mac in order to run Mavericks.

Demo is correct. While you can upgrade to 10.5.8 with a retail 10.5 installer disc, and the 10.5.8 combo update, you'll lose access to Classic unless 10.4.11 is on its own separate partition or external Firewire hard drive.

Take a look at this.

http://www.everymac.com/systems/apple/powermac_g4/index-powermac-g4.html

Tenfourfox can browse the web.

You can run older Office software for on it.

There are older PowerPC games you can run with it.

Its a very old computer, it can't even browse the web with acceptable performance. Used intel macs are coming under $300 for early generation iMacs, minis and Mac Pros. Any of them will be several times more powerful than any PowerPc mac ever made. (Yes, the ads lied about PowerPc being faster than Intel CPUs)

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Contrary to what DieselFuelForLife says, there are some who are at least happy with Tenfourfox:

https://discussions.apple.com/thread/5614365

Mind you, not everyone can afford new hardware.

maybe some older games if you can find them, like Warcraft 3, Diablo 2, Oni, or Lugaru.

http://warcraft3.filefront.com/file/;9235

http://us.blizzard.com/en-us/games/d2/

http://halo.bungie.net/projects/oni/

http://www.wolfire.com/lugaru

you might be able to find free demo versions to download to see how well a particular game will work with your system.

You could also find some games for younger kids, like Freddi Fish, SpyFox, PuttPutt, Pajama Sam, or Backyard Sports. Those were for Mac OS 9, but should work in Classic emulation, if you still have an OS 9 System Folder on your PPC. Or an older version of Mavis Beacon or SpongeBob Typing to teach a kid to type. Jumpstart series software for pre-K grade-level games, etc... KidPix for drawing.

If you want to do some photo editing and don't want to shell out the cash for Photoshop, try GIMP or GIMPshop. For school work, instead of Microsoft Office, you can use OpenOffice. There are many GNU-Linux opensource packages you can install using fink or DarwinPorts package managers, learn to code and write your own softare, with XCode and developer tools.