Let’s zoom in to see it better. Are you seeing the marching ants? See how precisely are the walking around the hair.

3 - Welcome the Brand New Select and Mask in Photoshop 2017

Refine the Selection Using Select and Mask Tool

Now, let’s go to Select and Mask. Activate it by pressing¬†Cmd+Opt+R/Ctrl+Alt+R.

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Suggest one tutorial that I MUST write.

Here Ya Go!
Give it a try at least.