Say, This is the general network diagram. How'd tcpdump help me in this case?
Just tell me "tcpdump helps to find ____" etc.
@Ihattaren , a vague question ...
as for the tool itself ...
general troubleshooting of network
general networking security (monitoring - potential attacks / intrusion attempts )
general monitoring - identifying bandwdith hogs
packet capture/analysis
- a host of other network related stuff
alternatives/additional/complimentary - Wireshark , Snort, nmap, netcat, ....
search for network/packet sniffer/monitors there's plenty of choice.
RTFM - do some reading of package capabilities.
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I am not able to start that's my issue. There doesn't seem to be good tutorials around this issue?
well, sometimes you just need to roll up your shirtsleeves and start messing around and see what happens.
if you don't have an actual problem then finding a solution is going to be difficult. 
a quick search online throws up a myriad of potential sources ... I've not checked any of them for quality/efficacy ....
[Exercise] Analyze Network Traffic with TCPDump | Coursera
I agree, I don't have any problems that I need to solve with tcpdump that's why this is happening. Or I don't know what problems I can solve with tcpdump.
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