Should a phonegap plugin be declared in the config.xml file?

Question

I am a newbie in phonegap development so I have a couple of questions:

1) I am using the accelerometer plug-in. I read in the manual that i need to declare the plugi

Answer 1

Config.xml is mainly used by phonegap build.

If you're using phonegap 3 you should manage your plugins using the CLI:

$ phonegap local plugin add https://git-wip-us.apache.org/repos/asf/cordova-plugin-network-information.git

The only config.xml you should edit is /www/config.xml, the others are automatically generated from that one when you build your project using:

$ phonegap build ios