created a shape, and there's shadow in random face

hi, i’m all new to Blender, and i was making a model of something, and found out when when i make my model smooth, there is some shadow on the face… near vertex


help anyone…?

btw, english is not my first language… sorry for poor english :frowning:

Hi, its the normal of the face that is in the wrong direction.
In edit mode select all and press Crt+N to fix it.