The WordPress customizer is a tool which allows you to edit all the style options from a theme and visualize the changes live, as you make them. To open it go to Appearance > Customize.
More Advanced topics are coming soon.
Chose LayoutAppearance > Customize > General options
Chose between No Sidebar, Left Sidebar, Double Sidebar and Right Sidebar. Changes should be visible automatically in Customizer.
Chose WidthAppearance > Customize > General options
Set your default site width here. Chose between 980px and 1170px.
Show / Hide MenusAppearance > Customize > General options
If you’re building “Landing page” type of site this option might come in handy. Hide menus completely with this option.
Upload LogoAppearance > Customize > Site Identity
Upload your own Logo / Icon and set Site Title and Tagline here.
Set header heightAppearance > Customize > Design options > Header Options
Fine tune header height that suits you with this option. Changes should be visible automatically in Customizer.
Show / Hide Author infoAppearance > Customize > Design options > Page/Post Options
Easily hide Authors Bio box with this option.
Show Footer Widget AreaAppearance > Customize > Design options > Footer
Show or hide four built-in Widget areas in the Footer.