How to bevel this simple edge?

[erdigo (erdi gogo)]

Hi everyone,
I made a quick shape in Blender where this triangle piece meets the cube. I tried to bevel the top edge to smooth it out but Blender refuses to bevel it at all. It is all the same object. Does anyone know why this is happening and how to solve it?

Here is a video showing how it refuses to bevel.

[oo_1942 (Kim)]

Not being beveled seems like a modeling problem.
You may have overlapping Vertex in the same location.

Merges the Vertex overlaid with the M key after the full selection.

[erdigo (erdi gogo)]

Thanks, but I am not sure what I am doing wrong. Here is how I created the shape, and I really do not know why it refuses to bevel. I also tried merge by distance at some point to remove any extra vertices that may have been added when extruding.

[erdigo (erdi gogo)]

After some tweaking I finally figured it out. I know what caused the issue, even though I am still not sure why that thing breaks the bevel lol. Either way, deleting that edge solved the problem.

[oo_1942 (Kim)]

You must delete the internal Face.

[erdigo (erdi gogo)]

Thank you. Exactly that worked, is there an explanation to why is that needed?

[oo_1942 (Kim)]

There should not be a face or edge across the interior in polygon modeling.
This requires you to learn basic information about polygon modeling.

I don’t know if that video can be helpful.

- YouTube

It’s not easy to explain the details in detail because I’m not an English speaker.

To put this straightforwardly, in an image-like configuration, Bevel doesn’t know where to cut.
There are 2 faces, so I don’t know how to cut them.

[erdigo (erdi gogo)]

Thank you so much. this is more than enough. you’re right, Im missing some basics, and it’s probably time for me to work on those.