Creating Faces for a complex geometry

Hello all
G’day

How does one create faces for a complex geometry like this?

By faces I am alluding to what the six planes would be for a geometry like a cube.
Sorry I am a complete newbie. But glad to be here!

In the end I am hoping to have 2 faces - one at each end with all the dendrites included.

Hello,
A face is “Part of a plane (in 2D geometry) or a surface (in 3D geometry) bounded by a closed wire”.

In your geometry (imported from a stl file apparently), each triangle is a face.
So you have hundreds or thousands faces.
You can use “What is” feature to see the number of faces.

So I don’t understand what you mean when you say that you want to have 2 faces?