Well it depends on your router, it depends on the ports it automaticly blocks, it depends on your router. If you want to be sure, access your router (192.168.0.1 or 192.168.1.1 if u didn't know that ) Then just activate DMZ that will allow all traffic to access easily although it might be unsafe so only use that if it's really slow.
When it comes to downloading torrents ports doesn't have such a huge impact so don't worry, just download, the time of an open port or closed port makes a torrent be downloaded in 10 min istead of 15 for example so it's not worth portforwarding

have a good day