nes modding?

[newbie]

Hi, Im interested on nes modding. I heard that I can use a modchip on it to play wiht pirate games. Is that true?
If I have done a wrong question, please let me know and I will erase the post.
PD: What type of modding can I do to my NES?? (Im from spanish)
Sorry about my poor english and I hope you will understand the post; thanks  :rolleyes:  

[atom]

Aw come on lawrence, write a disclaimer already.