ArcGIS Online

ArcGIS Online is an online, collaborative web GIS that allows you to use, create, and share maps, scenes, apps, layers, analytics, and data. You get access to ready-to-use mapsapps, and Esri’s secure cloud, where you can add items and publish web layers.

For more detailed information visit What is ArcGIS Online?

Set up a free Esri Organizational ArcGIS Online account for your school.

Setting up an ESRI Organizational account for your school is free and relatively simple. You will need at least one person to take the responsibility of being the organization administrator. Get started by going to ESRI Education. Scroll down the page to the instructions for setting up a free account.

ArcGIS Online Story Map

ArcGIS Online Story Maps enable you to add images and video to your map. Click this link to see an example of a South Dakota Lakota Language Story Map.
To learn more about making Story Maps go to Story Maps Tutorial.

South Dakota GIS: Open Data

This is a great source of layers of information specifically for South Dakota.