Ah, thanks, that explains a lot.
Yes, I was aware about the "roll twice and take the better" thing, but not that only these Advantages are counted for Sneak Attack.
So the green remarks on targeting are information which are *not* helpful for Sneak Attacks.
Is there any other way of getting the information about real Advantages than knowing them by heart?
And: I guess there are Advantages which are not shown as green information?
That would explain my example with the stick monster:
High Ground and Magic Weapon are shown green and help but don't count as Advantages.
Later when the stick monster had climbed up, it was standing next to an ally (my Gloomstalker Githyanki Jirvan in fact).
That would explain why Astarion had an Advantage.
But that was not shown in green while targeting.
Which would mean that Advantages and green info are two separate things altogether.
Could you please explain the "Mage Hand" trick?
My character Jirvan can do this (as a Githyanki). But I could never find a good application.
I thought I could use it for manipulations, when I couldn't reach the thing to manipulate. But that didn't work...
Thanks again for your help!
