@: Thanks a bunch for all the videos and links! Will definitely dig through all of them! 
@Sam Deiter: Thanks a lot for the link that covers all of the foliage tools! The RiverTool looks quite promising - still trying to figure out how it works. I can’t really influence the flow-direction of the river by moving the control points. Do I have to enable the Tool somehow to make it work ? Also the green dots are not selectable so I’m wondering how I can change the flow-direction of the river ? Could you maybe point me (and other devs here in the forum) in the right direction on how to start making my own river?
Also the deer-AI is quite impressive - how they flee from the drone and all. Is there any In-Depth explanation on how everything works together ? Sorry for all the questions but I’m super excited to learn all the stuff you’ve made in this demo. Besides all of the new foliage tools it would be awesome to have someone from Epic explain the deer AI and RiverTool a bit