Hello qwk I decided to make use of the trust system but I'm a little confused, lets say I decided to add the users below to my trust list, from the image below please answer my questions.

1: what's the maximum number of users I can add to my trust list?
I honestly don't know if there's actually a maximum number.
2: that which the back arrow is pointing at what does it mean?
That's the title for "Depth" mentioned in the introduction.
3: that which the red arrow is pointing at, what does it mean and what's the maximum number to write there?.
That's the value of "Depth". You may want to set it to 1 or 2.