I'm using these lines in pf.conf on the PC which I'm using to post here:
block in all
pass out all
This does the job for now while I learn more about pf, mainly from reading the Hansteen book. The above lines and what they do are described on page 17 of the book (3rd edition). I'm just an OpenBSD noob though, so I would strongly recommend that you follow jggimi's advice and learn what these rules do before blindly copying them.
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