How do i manage heading 1 to heading 6?

In the WordPress dashboard go to the appearance submenu and click on customize. After clicking on customize you will in theme customizer.  than click on Typography -> Headings. Here you can manage Heading 1 to Heading 6 like(Font Size, Line Height, Font Style, Text Transform Feature setting)

How do i manage body typography?

In the WordPress dashboard go to the appearance submenu and click on customize. After clicking on customize you will in theme customizer.  than click on Typography -> body typography. Here you can manage body typography like(Font Family, Size, Line Height, Font Style, Transform Feature setting)

Switch On/Off typography feature?

In the WordPress dashboard go to the appearance submenu and click on customize. After clicking on customize you will in theme customizer.  than click on Typography -> Setting now here Settings Enable / Disable Typography. Firstly you can switch it on to change typography.  

How to select layout in below Footer?

In the WordPress dashboard go to the appearance submenu and click on customize. After clicking on customizing you will in theme customizer.  then click on Footer Section -> Below Footer. Here you can select layout & you can also enable or disable the below footer section by clicking on a single button.

How to change footer widget area layout?

In the WordPress dashboard go to the appearance submenu and click on customize. After clicking on customizing you will in theme customizer.  then click on Footer Section ->  Footer Widget Area. Here you can select the layout footer widget  & you can also enable or disable your copyright content by clicking on a single button. […]

How to manage gallery & column setup?

In the WordPress dashboard go to the appearance submenu and click on customize. After clicking on customizing you will in theme customizer.  Here you have to click on Page Template than Gallery Page. In the Gallery Section, you can manage the Gallery Page like(Title, Description, Link, Icon & Column Setup).