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Depends a lot on your budget, learning method and so on.
Wireshark in itself isn't that complicated. You can learn a lot by looking at all the youtube video from Chris Greer.
If you got the budget I would go for https://scos.training
But beside Wireshark it realy is all about understanding the network protocols. So any decent networking training that digs into those protocols will be useful.
Okay, I clearly stole this answer, my apologies. But have a look at the Wireshark and SharkFest websites to find other learning opportunities.