Shading after Boolean

Question

How do i fix this kind of shading after using boolean mod?

EDIT:

I can make the shading better by applying the modifiers and fixing the topology this way. New Shading New Topology Shading without Boolean

Possible duplicate of Applied boolean modifier leaving shading artifacts with flat shading — aliasguru, Nov 28 '18 at 18:55
your boolean must have created a bad topology, maybe it would be simpler to create your holes manually — moonboots, Nov 28 '18 at 19:00
@moonboots How would i cut that kind of hole manually? And isn't there a way to fix the topology and shading? — Skullfaceguy, Nov 28 '18 at 19:38
All of these questions have been asked before https://blender.stackexchange.com/questions/5856/cutting-a-circular-hole-in-a-hollow-cylinder-without-distorting-the-cylinder also https://blender.stackexchange.com/questions/3260/how-to-cut-a-rounded-hole-in-a-sphere/3262#3262 — Duarte Farrajota Ramos, Nov 28 '18 at 20:05

moonboots · Accepted Answer · 2018-11-28T20:48:19.527

I guess there are 2 main ways to do it in a clean way: with Boolean or with LoopTools > Circle.

With a Boolean modifier you must make sure that your boolean object is well placed and has the right amount of vertices. You will probably make some vertices merge. Don't forget to bevel the ring so that it stays clean and sharp.
With the LoopTools > Circle tool, you must first delete some faces, use the LoopTools > Circle, then extrude inwards and close it manually.

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