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With 'free wifi' most harmfull stuff is not actually related to your firewall (unless you block everything, which makes no sense).

A person who owns that wifi network in one way or another can :
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tcp ports are dictated by IANA So if you decide to "secure" port 25, nobody will be able to connect using ftp.

This link has 140 pages, just read a few.
Service Name and Transport Protocol Port...