There are a small set of headers that will bring all the core module functionalities that need to be exposed to the user:

#include<vclib/types.h>: includes all the basic types used by the library. It is generally not required to include it since almost all the other library files include this header;
#include<vclib/concepts.h>: includes all the c++20 concepts of the library. They define all the constraints that a template type must satisfy to be treated, for example, as Mesh, Triangle Mesh, Point by a function (e.g. an algorithm) or another class.
#include<vclib/miscellaneous.h>: includes a list of miscellaneous classes, functions or utility structures (e.g. comparators, loggers, timers, ...);
#include<vclib/space.h>: includes all the spatial (but also non-spatial) data structures of the library, with the exception of meshes. These data structures are used by the library algorithms but they are meant to be used also by the user. Examples of data structures included by this header are Points (2D, 3D, N-Dimensional), Boxes, Triangles and Polygons, Planes, Spheres, Segments, but also complex structures like spatial regular Grids, KD-Trees, Graphs;
#include<vclib/meshes.h>: includes a set of predefined Mesh data structures, such as Triangle Meshes, Polygonal Meshes, Point Clouds, Doubly-Connected Edge List Meshes. Along with the predefined meshes, all the definitions that allow to create a custom Mesh data structure are included using this header;
#include<vclib/load_save.h>: includes all the functions to load or save meshes into the formats supported by the library;
#include<vclib/algorithms.h>: includes all the algorithms implemented by the library. Algorithms in VCLib are simple functions that take arguments constrained by concepts. Most of the algorithms work with Meshes, but also some other utility algorithms that work with other entities are included by this header (e.g. distance or intersection functions);
#include<vclib/views.h>: includes all the c++20 Range Views of the library. They allow to iterate easily along all the elements and components contained by the Meshes;