1.Can JQuery mobile be used with Visual Studio? If not, what editors do you suggest?

这样你可以选择任何你喜欢的编辑器。

一些流行的编辑器命名一个 WebStorm，Sublime Text，Eclipse，Visual Studio。

2. What does it mean that JQuery mobile can be used with PhoneGaP? I thought these 2 were separate frameworks?

JQuery是一个HTML5，CSS3和JavaScript框架。

PhoneGap是一个Webview框架。

PHoneGap允许您使用任何 HTML5，CSS3和JavaScript框架（上述UI框架），或者您只需使用普通 HTML5，CSS3和JavaScript 无ANY 框架构建应用程序，然后将其包装在PhoneGap中。

使用PhoneGap，您可以访问 DEVICE API ，Acrobloremeter，Camera等），否则不可能只使用HTML5，CSS和JS。

JQuery is a HTML5, CSS3 and JavaScript framework.
PhoneGap is a Webview Framework.
PHoneGap allows you to use ANY HTML5, CSS3 and JavaScript framework ( UI frameworks mentioned above) OR you could just use plain HTML5, CSS3 and JavaScript without ANY framework to build apps and then wrap it in PhoneGap.
Using PhoneGap you can have access to DEVICE APIs (like Device contact list, Acceloremeter, Camera etc), which otherwise would not have been possible using only HTML5, CSS and JS.