Blender is probably the best free solution to create 3d models. If you want to take a few screenshots in Blender, here’s how
Blender 3D

Blender Screenshot

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1. Either use the keyboard and hit the button “PrtScn” or

2. Click on File, then DUMP 3D View or

3. Click on File, then DUMP Screen

All 3 methods should work to take screenshots in Blender. If you want to create a “real” render of your models, you should read the Blender manual. Rendering is how you would normally take pictures of your models.

Watch this Blender Youtube video to get a clue: