Ok an N-pole shading error - (a vertex where 5 or more edges meet) which forces Blender to average face normals across different angles, causing dark spots or "pinching" artifacts when using smooth shading. And here's a few options that may resolve the problem 1. To fix the Normals and Smoothing often, shading artifacts…
Instead of solid mode with phong shading - I'd preview whatever 'lighting' artifact you think may have occurred in either lookdev/material or cycles viewport lit with a basic 3 point setup which would enable people too offer more effective feedback, if applicable?
Despite the possible fixes, it's best not to worry about minor shading issues like this early on in the modeling process. Usually these little things are not at all noticeable in the materialized surface, and totally not worth the effort to fix at this point. Complete the texturing and import into your renderer and apply…