After editing your theme and previewing it across different devices you may find that some sections just look better on some devices. For example on mobile devices you may want to use a slider instead of a grid section.
Go to Online Store > Themes > Customize
Select the section you're looking to hide
Scroll down to Display then click either Show on mobile only or Show on desktop only
Hit Save
Start by connecting your source repository and choosing the pages you want to publish.
You can then browse your documentation and ask questions about the content your team has shared.