Create a gateway portal, through the use of Blueprints inside of UE5. Learn Blender in order to make a mesh for your portal. Dive into Niagara to add particles and VFX to it. Explore Substance Designer for textures creation. Learn UE5 Material Graph in order to create a the portal vortex. A step-by-step video series.
https://dev.epicgames.com/community/learning/tutorials/kBp3/unreal-engine-creating-a-functional-gateway-portal-in-ue5