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Firewalls: what SHOULD I block?

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Cornflake@lemmy.wtf
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Hey there folks,

I’m trying to figure out how to configure my UFW, and I’m just not sure where to start. What can I do to see the intetnet traffic from individual apps so I can know what I might want to block? This is just my personal computer and I’m a total newbie to configuring firewalls so I’m just not sure how to go about it. Most online guides seem to assume one already knows what they want to block but I don’t even know how/where to monitor local traffic to figure out what I can/should consider blocking.

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ReversalHatchery@beehaw.org
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A firewall (at least in Linux) blocks everything inbound by default.

are you sure? I thought that at least UFW allows through some common LAN services

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