Some triangles are filling in on the bottom and in the bite area
I have probably the same issue on the top and on the bottom. And bevel modifyer doesnt work. I tried few times and both got the same result
I don't know if this is exactly the same case with @bbbbb as here in the picture, otherwise explain in more detail or send a screenshot
So the one in the picture looks like the normals are not correct.
Click on - Show Overlays -> Face Orientation in the top right corner.
If faces are red, they must be recalculated. To do this you have to go to Edit Mode -> Face Mode -> select all faces or only those that are red and then ALT + N.
If it is only one face, flip option is sufficient, if several are affected, use the recalculate functions.
I would perhaps check the vertices first. So Edit Mode -> Vertex Mode -> A (mark everything) -> M -> Merge by Distance.
At the bottom of the bite it looks as if there are several vertices on top of each other.
Thank for your answer. Face orintation was right. After vertecies merging bevel modifier starts work fine. But triangle shading is still here. I do not know if it is important or not.
I already have tried scale points to one level before I wrote here, but it doesn't changing shading
Using the Overlays/Face Orientation I found several Red areas; faces on top (the two buttons near the bite) and sides (the bite mark) were red. Selecting All Vertices and Merging by Distance fixed the problem. But, I now have a question about the display screen and top Power button, which are blue, but both have faces that appear to contain a variety of different sizes and shades of blue triangles. What are my steps to fix this problem at this point? Thanks for all of help.
It is best to take screenshots. the quickest way to do this is to press the Windows key + Shift + S and wait until the Windows snipping tool starts and you drag a frame from Blender.Then you can simply press CTRL + V and insert the image in the answer field.
Or like Omar said, just upload the file and share it.
