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Just be aware that a firewall will only protect you from external sources trying to connect to your PC. Your network router should already be doing that, as it will be using NAT to hide your local network address from the wider Internet.
A firewall will NOT protect you from malicious websites, or any of the nasties that use your web browser to get in.
Pull up your PC's network information and I can pretty much guarantee your IP address will be of the form 192.168.X.Y. (There are other reserved IP address ranges, but I'm not going to get into them here.)
Then open a browser and hit any of the "what is my IP address" websites. The value it returns will be different.
Your WiFi gateway / modem-router / whatever is doing address translation to keep your PC's IP off the Internet. It's doing more, but I'm trying to keep things simple.
So, don't bother with a firewall. Invest in a good anti-virus / anti-malware program instead.
V.
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