@SlowCoder

I don't have time to waste with such things.
I'll have a call with someone from a security company selling computer equipment, to have this figured out.
My ISP's router is the latest and has firewall builtin too.I'm not sure about your ISP, but my ISP provides a firewall as part of the router. So I'm already as secure as my ISP wants me to be, which is usually allow outbound connections, deny incoming connections. So, do I need another firewall on top of that? I don't think so. But every layer of security makes you stronger.
Honestly, it either adds substantial security and privacy, or i won't even botherSo, it won't hurt you to have a hardware firewall, if you feel it's necessary or helpful. Or if you just want to futz around with it.
I don't have time to waste with such things.
I'll have a call with someone from a security company selling computer equipment, to have this figured out.