Signatures is a important topic that I urge all of you to not skip over and to study through a good portion of your earlier energetic "Career" as not only can this lead to a lot more topics in the later stages but this is one of the more so important ways to identify others on this path.
There are two different, well technically three different types of signatures, energetic, mental, as well as "soul" for this guide we will discuss the first two in-depthly.
FIrst off, you should know that all types of signatures are the same in the terms of they can be traced back to the person they come from almost no matter what, no person creating a mask to act like them will work, rather, the person can block you off from them but you will never be tricked into following someone else with signatures, as no two signatures are alike.
Now then to begin to identify energetic signatures you should begin to connect to the person in a manner that is best for you, preferably through the use of a scanning method.
Now that you have connected begin to look for a deeper feeling from the person, it may take a bit of time to notice, but to speed this along feel multiple targets and look for the sensation that always changes per person, once you found that, then you most likely have found the signature, the key to knowing if you have is through feeling the signatures of people who are approaching you and then seeing if you can figure out who that person is just through the signature. (People you know already, etc)
The mental signatures work in the same way but on a mental level, it requires normally for you to feel there thought/mindscape to identify which is in a later unit.