Click the Publish button.
A shortcode is a powerful content building tool click here Shortcodes are easy to use. First of all, make sure that the editing mode is set to Visual.
Contact Form : [contact-form-7 id="5" title="Contact form 1"]
Gallery Shortcodes : [bwt-galleryshow bwt_gallery="53" numberofitem="8" bootstraponecolsize="4"]
In order to proceed with Widget section,
Go to Dashboard Appearance Widgets.
It will be appear on page like this