What are some good network analysis tools I can use to see if I'm owned?

What tools can help me do forensics on my network? I feel like there has to be some sort of tool that can help me determine if my packets are going where they should be, and I just need to be pointed in the right direction.

I think that drawing a big “hacked” symbol on my forehead would be too simple. Something automated would be nice though. Please be patient. I’m a slow learner and I need someone to help me along.

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OpenSnitch, with the workflow described in this blog post for the Librem 5: