Trusted Credentials

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http://forum.xda-developers.com – I know another stupid question from a noob. Under settings, security, trusted credentials. There are so many and a lot of them are in different languages, never really paid attention before. Why are they there and how do I know if they are really trustworthy? What would happen if I started disabling them, am I going to screw things up? Or are they just credentials from web sites that I visted and disabling them would just prevent me from going to that web site? Thanks (HowTos)