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so I have just started on blender 3D modelling and have a question regarding it. Now, I'm planning to create a 3D Octopus, and I'm stuck at the tentacle's suckers. After I shade smooth the tentacles, the tentacles appear to have wrinkles, how do I solve that?

enter image description here

I tried Knife tool too.

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    $\begingroup$ please edit your question and show an image of the object in edit mode in a way that shows the topology. Most likely you are dealing with n-gons and non planar geometry. Did you use booleans? $\endgroup$ – susu Aug 8 '20 at 1:41
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    $\begingroup$ related: blender.stackexchange.com/questions/49639/… $\endgroup$ – susu Aug 8 '20 at 1:50
  • $\begingroup$ As supected: n-gons (polygons with more than 4 vertices) creating non planar faces.. Start over and try to keep quad topology. topology-guides.tumblr.com/page/3 $\endgroup$ – susu Aug 8 '20 at 2:36
  • $\begingroup$ I don't think you need to start over, add a loop cut (CTRL R) between the suckers. If the problem persists, make quads from the 1. vertex that pokes into one of your ngons and the middle loop. Or add a multires and see if you can just use the smooth brush to avoid the ugly normals. $\endgroup$ – Frederik Steinmetz Aug 8 '20 at 6:39
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As it has been said, your topology is bad, the stretched triangles create these artifacts. To fix this, use the knife (K to activate, Z to cut through) to create new edge loops, and join (J) the vertices like that, and it should work:

enter image description here

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