This short video shows how to get started with Experience Building using the Gallery Template. This type of template can be used as a “landing page” to reference links for other apps (GIS-based or other).
Experience Builder System (arcgis.com) – use this to login to get started designing in Experience Builder
ArcGIS Experience Builder | Build & Deploy Web Apps (esri.com)
Get started with ArcGIS Experience Builder – Gallery template (esri.com)
Get started with ArcGIS Experience Builder: Foldable template (esri.com)