So how can I select an individual hair? My friend told me that ctrl + numplus should work. but for some reason it does not. So the way I do it now is just drag and select all points of the hair. But maybe there is some option for one-click select a hair?
Select one point on the hair and use Ctrl+Numpad+ to extend the selection
or
Select one point on the hair and without moving the mouse press L to select all linked points on the hair