wireshark exercise

Hi

I am a reader of the book "Troubleshooting with Wireshark: Locate the Source of Performance Problem". This is a very good book and I learn many of skills about TCP/IP troubleshooting, but I still feel weakness when I start to do troubleshoot in my work. I think I need to do more exercises.

So, Are there any resources of wireshark on the internet to provide more scenario which can let me do more exercise to enhance network analysis? Or is it possible to publish a book which has many scenario and also provide the pcapng file so that I can try to find out what the problems are? Thanks in advance if there's any information about that.