Organic shapes 3D modeling

Hello everyone,
Does anyone in this Forum can share a tutorial which explains a workflow to model complex shapes (e.g. organic or rounded, among others)? I am particularly interested in learning the workflow but also getting to know the most powerful tools and extensions with it. Any comment will be very much appreciated.

There are a number of excellent YouTube video tutorials. Just search using:

organic modeling in sketchup

There is one that I found useful using the “Quad Modeling” concept located here:

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Thanks it helps a lot!