Right section is page content that you can edit it via Page Builder, Go to Pages and edit Home page

Or in your site front page, in the admin bar find Edit Page ( Back-end Editor ) or Edit with WPBakery Page Builder ( Front-end Editor )

This is Gallery element, you can find and edit it in Page Builder with ease.

For changing Logo go to Theme Options > Header > Logo

For changing size and margin, go to Theme Options > Header > Fixed Side > Logo element

For editing or removing Back to Top or Quick Contact items go to Theme Options > Footer > More

Instead Quick Contact also you can create any page and assign it.

For changing Copyright text go to Theme Options > Footer > Bottom of Footer > Icon and Text Element

This is a 360 Degree element that you can edit it and add your 3D Image sprite sheet, its very easy and you can turn Off the handle and style them with stylekit.

This is Title and Text element, that you can edit it with ease in page builder.

For changing the Shape of Arrow you can go to Shape tab of this element edit box.

For editing menus items go to Appearance > Menus

For editing menu navigation settings go to Theme Options > Header > Fixed Side > Menu Element

And for styling menus go to Theme Options > Header > Fixed Side > Menu Styles of this Row

for editing the Social Icons go to Theme Options > Header > Social Icons

you can set the hover FX and styling the icons via options and Stylekits there

For changing margin (Position), go to Theme Options > Header > Fixed Side > Social