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Knowing, or not knowing, an IPv4 address is nothing special.
Using this involves you finding your IP address (physical address), going to the relevant door (port 21), and then using the program (mucking around in the room).
Most of the time this room will be completely safe for people to play around in, they can't go anywhere else.
Both of these will prevent arbitrary incoming traffic from hitting your computer. My suggestions: @schroeder Sure, but most firewalls these days are point-and-click, so by default they just block everything.
Windows Firewall) or are behind a NAT router, you're probably safe.
That online shop knows your name and address, that online radio knows what music you like, that Q&A site for programmers knows what your technical skills are, that dating site knows your age, that career portal knows who you work for, that discussion forum knows your political opinion, that porn site knows your secret fetish...