I just started blender and I have a basic problem often when I use subsurf modifier. Most times it works well but also occasionally some edges wouldn't be smooth. For example, I was doing a tutorial this time making a faucet in the bathroom. I made this model simply extruding a circle. Then I added the modifier. But one round of edge is sharp as before like in the picture. It may be a simple mistake or misunderstanding but as I just started learning, I can not really figure it out :( It also often happens when I add more shapes into models. I appreciate your help so much!
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1$\begingroup$ it could be that you duplicated that edge circle, maybe extruding. try removing doubles. $\endgroup$ – m.ardito Nov 10 '17 at 9:48
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Yeah, there are several double vertices. You can check by Alt-leftclicking the questionable edge, and move the now selected edge loop down.
To repair, select all vertices in edit mode, and click Mesh > Clean up > Remove Doubles.