Hello ,
Ranked from easiest to hardest:
Volcano: Triggering Particle Effects with Blueprints | Unreal Engine 4 Tutorial - YouTube
Blocks: AttachToActor node
Cradle: UE4 - Tutorial - Physics Constraint Actors - YouTube
Cutting: Quick Start to Slice Procedural Mesh in 4.13/4.14 - YouTube
You might want to just focus on one or two.
Hope that helps get you started!