Solved Funky shading on edited part

Hey, so I am working on a project and needed to make a custom hood for the Piccolina, but the cut version has some shading issues. I know there's a fix for it, but I can't remember what it was. Can someone help me out?
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Have the same issue. The model of one of my friends has this problem too. I'll be really thankful if someone help

 

this is not a bug you just need to learn the fundamentals of 3d modeling. Nothing should ever be sharp, it should always be beveled. Always recalculate normals. Remember to uv map.

 

Try adding an edge split modifier.

 

That fixed it, thanks!