Plain Text widget is one of the simplest widgets available. It can be used for inserting a plain text content and/or adding some content via shortcodes. It comes with a very basic set of options that control alignment, width and text alignment, however, all formatting can be skipped entirely in which case just a widget content will get printed and nothing else.
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Style widget doesn't output any visible content by itself but it can be used for adding some custom CSS styles to specific elements on a page. Note that if you're planning certain styles to be available globally you'd rather use Ether > Builder > Custom CSS section instead.
Link widget is nothing more than a specialized HTML widget for inline use. All you need is a title and a url, and all you get is a plain simple link.Such as this one
This widget will display content from your visual editor. Insert it wherever you’d like visual editor content to appear in relation to Ether Builder widgets.