TOPIC:

I wanted to do a standard shipping for all products except for one category to which I wanted to do it for free. and so far I have done so
Name = standard; Categories! = List (9) Shipping = 9
Name = Free; Categories == list (9) Shipping = 0
but that if I wanted the basket there were mixed products ie those on normal and free shipping cost had another .. but I could not configure it with them using the sku Categories

Name=standard;Categories != list(9); Shipping=9
Name=Misto;Categories == list(9) AND Categories<2 ; Shipping=6
Name=Gratis;Categories == list(9); Shipping=0

How can I do?

If I understand you correctly, you want shipping costs as follows (notice that I rearranged the logic a bit):
-) I the user only buys products from category 9, shipping is free
-) Otherwise, if the user buys products from category 9 AND some other category, shipping is 6
-) If the user buys only products from other categories (i.e. the conditions of the first two lines are not met), then the shipping is 9

With my plugin, a rule will only be evaluated if none of the rules above apply. so e.g. in the second rule you can safely assume that the conditions of the first rule are not met. With this additional knowledge, your rules can be written as:
The first rule checks whether category 9 is the only category, and in that case provides free shipping.
In the second rule you know that category 9 is NOT the only category, so we only need to check whether category 9 is in the cart at all.
And in the third rule we know that category 9 is NOT in the cart at all, so we don't need any further checks.