F you're a beginner then I think my first advice to you is to not use Blender. Start with something like TinkerCad, much easier to work with, and more than adequate for what stated.

TinkerCad lets you add shapes together, and the neat thing is that there are also hole shapes, negative volumes that you can use to cut away material.

So, out of the box, blender is not a cad tool and it’s not a good option for anything that requires any amount of precision- there are extensions that will help, I’d just as soon suggests any other cad tool.

That said, if you can, link the files you’re using and the, we could give give you a more precise work flow.

I found windows 3d builder to be very beginner friendly for modifying basic shapes.

Prusaslicer has some pretty good stl manipulation tools built-in these days. You can merge, split, add common shapes, subtract shapes, etc.

From the outside looking in, it seems like you should be able to do everything you want right in the slicer.

I've found this to be preferable for working with existing stl's (not as useful for editing) if you dont have the actual step files or 3mf files available.

Does something like this works for you?

https://drive.google.com/file/d/15lq4Fz3rzJdIM7iXbC3JB79-IPjsTIzY/view?usp=sharing

I just imported the 2 stls in blender put them together, like in the same place as you wanted

Selected both as seen in the image, then File -> export -> STL. Make sure you have "selection only".

Export it, open it in your favorite slicer, and that should work.

Blender can do a lot, I use it to design and modify a lot of things from thingiverse too, and I have learned a lot of tricks on blender too.

I also want to learn freecad to do stuff from scratch, but in the meantime blender does what I need.

EDIT: Most probably I did not understand the requirement correctly, is this supposed to have a hole? hit me up if you want, happy to help https://discord.com/users/poringo#6290

Another Edit: Oh something like this?

Do you have some pictures and drawing to explain what you want to achieve?

I agree with the comment about using something simpler than Blender. Blender is the right tool for organic shapes and for sculpting.

What I understand is that you have two models, one for a phone case, one of a "hole" for fixing a magnetic holder.

I use OpenSCAD. With this tool, this would be my logic (could be replicated in other tools :

• import the mag holder stl
• create a rough shape, like a cylinder, that would fill the hole
• make a "difference()" between the cylinder and the mag holder. This way, the cylinder has the shape of the complex hole. You can then use this shape to make a hole in the stl of the case
• import the case
• import the mag holder once again / or add a volume the shape you want
• use "difference()" between the case+mag holder and the complex hole shape to clear the hole

you can enhance this process by creating a negative shape of the buttons holes

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If you want to use blender for this you should be able to use a boolean operation to combine the two bodies you import. Your computer should do the second step for you in any reasonable modeling software.