Home page full width slider

I do feel like an idiot here but I am really baffled as to how I add in a slider for the home page (and other pages) that displays just below the header and above the content.

I know how to create the sliders but do not know how to add the shortcode to the correct place and despite hours of looking, I am none the wiser.

My previous attempts have resulted in a full width slider that then merges into the sidebar and content rather than being above it.

Help! I’m sure it is obvious once I know how.

Many thanks