As said the title;
Is it possible to know if two or more addresses are related to one wallet? and if from transactions i can figure possible connection (same wallet) between addresses.
I post this here because i think it's a beginner question, no?
From the context of what you just posted, with just looking at the transaction details, observing the change addresses help. However if you want to analyze 1 address from 1 random-picked address and determine whether they came from the same wallet? I don't think that will be pretty easy to do, or perhaps even make sense at all.
so what's it's all about those analysis tools and what help for?
Analysis tools are usually for following the 'trail' to which the coins are sent to, and are used mostly for nabbing criminals and people who use bitcoins for bad intentions. It can also help in linking a connection in between different addresses, though knowing whether the addresses came from a single wallet? I don't think so.