No, you don't need to use a computer. You can connect the PSP straight to the PSN, and download games directly.
download them on the computer then sync them on to your psp
You don't use the computer, you connect the PSP directly to the PSN, to purchase and download games from there.
you dont
Yes, you can.
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One can find free downloads of PSP games from pspshare and pspube. One can find and watch hundreds of free PSP games from Youtube and download from there.
In the playstation store
some of them are free to download like demos.
You can download free PSP games from PSP blender, and many torrent sites. You can also try out demos of a game on several sites. However, that depends on if this means legally or illegally.
Games that are downloaded without payment is piracy and the Playstation Network has exclusive rights to PSP Go download sales
The PlayStation Network might have a free game for download occasionally, check there.
You can download it from psn. You either need to install it on your computer or access it on your psp if your psp version is 5.xx.