You can find many written tutorials on the wiki and in the documentation
https://wiki.unrealengine/Main_Page
https://docs.unrealengine/latest/INT/
open world -> https://docs.unrealengine/latest/INT/Engine/LevelStreaming/WorldBrowser/index.html
You can find many written tutorials on the wiki and in the documentation
https://wiki.unrealengine/Main_Page
https://docs.unrealengine/latest/INT/
open world -> https://docs.unrealengine/latest/INT/Engine/LevelStreaming/WorldBrowser/index.html