Instant messaging security analysis

Hello Everyone,
Recently, I was interested in the issue described in the topic and how it would be possible to perform sample tests
and what tools could be used in such a case.
What I mean here is to show how End to End (E2EE) encryption works and other examples of this type.
and what tools could be used in such a case.
What I mean here is to show how End to End (E2EE) encryption works and other examples of this type.
I read the white papers of messengers like (Wire, Skype, Threema, WhatsApp).
The problem is that I don't know exactly what I'm looking for as I'm new to this IT field.
Application / Manual that will allow me to compare the previously mentioned communicators by research (using Wireshark or something else ...). Something that will allow me to examine the communication between these communicators.
The only thing I got to myself was the possibility to create, for example, my own OpenFire server and to open 2 clients on different virtual machines.
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