Before I start I would advise you to watch this video to help with your understanding of behaviour trees and how to apply this knowledge to Roblox studio:
Why should you be using behaviour trees?
Behaviour Trees in Roblox Studio become increasingly more important the larger the game/NPC. They simplify NPC development by breaking down complex behaviours into easy-to-understand chunks, making them easier to design, debug, and scale. Since BTrees uses a modular structure, you can create smarter, more flexible NPCs that react dynamically to the game world. It’s the perfect blend of control and creativity.
What is a behaviour tree?
It's weird to explain but think of the tree as a path the NPC takes to allow it to come to life! More specifically, it’s a structured, visual way to create decision-making processes by organizing tasks into a hierarchy. With clear branches for actions and decisions, Behaviour Trees make your NPC smarter, more adaptable, and easier to manage—perfect for large scale games!An example tree for a simple zombie:
How do behaviour trees work in Roblox?
If you want a more in-depth explanation of how the trees work within Roblox studio, then check out my video. Essentially, using the BTreesV5 module we can create a layout for the tree and code the nodes called “tasks” to give the NPC’s it’s decisions to make. For example i made a zombie boss as you can see in the video using this tree:
If you have any more to add to this, please feel free to leave a comment on my video or on the post to help out.