How to make a 3D model in Blender?

Question

Blender

there is a complex 3-D figure. with cutouts, voids, etc. there is a sample. It needs to be 3D printed. What's the easiest way to model it? Recommend a manual or course.

ps Of course, it would be ideal to cut it and model it in layers. if nothing better comes up - I will cut (naturally with a hacksaw)