Content creation

Can anyone recommend optimum image deimensions for 'Course Presentation' without a key word list, so full screen image style like this example 

New user here.

In creating "course content," I find that I want to  change the order of slides in a lesson.  I don't seem to know how to do that.

I'm using H5P in an Opigno (Drupal) installation.

Is this possible?  If so, how might it be done?

Hi,

for some reason I cannot find the drag and drop question in my list when I try to create new content. Is it hiding somewhere with a different name?

Thanks,

Ayelet