question

[Anne-Claude Prélaz Girod]

hello everyone...

I need some help about symbols which are not clear to me....

first I'd llike to know what's the difference between those 2 symbols
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...
  does it make a difference to chose one or the other... and how do  
you chose between these 2

then I'd like to know the difference between those 3 symbols.... 
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and finally....  about the next 5 symbols....
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I'm pretty sure hand must be placed at a special place so that one  
doesn't misunderstand between opening and closing middle joint.... is  
the hand position important (like in Val's explanation about  
positionning of the arrows around the hand... the hand being placed  
in the middle-.... see in the e-lessons)

what's your experience about theses symbols!!

thanks in adance for your help

Anny