Please help!How to jail break my iPhone 1.1.4 version to the coolest jail break and the safest?

How to jailbreak in a safe way and what cool apps are on the jail break,will it erase my iPhone stuff completely?also erase my contacts?I’m pretty new so I wana know tv safest and easiest most up to date way,I’m pretty techno savy so yea,and my operating system is a of,windows xp.