Tap Model

Here is a tap model. The levers and the inner section at the top were created using extrude, then i used soft selection to make some parts look more interesting, for example used this tool to make the bottom lever go inwards at the top and create a curved bottom.
Also used bevel at the sides of the levers to yet again make it look interesting.
Chamfer is a useful tool to make sharp edges become straight angles then you can keep adjusting to create the illusion of curved edges, but this tool was helpful when applying MeshSmooth as it made edges and angles appear smoother.
Lastly MeshSmooth was applied to make the overall tap smooth, this tool allows you to adjust the smoothness rather than just applying it.