Firewall and Internet Security

I managed to compile bitcoin-qt by myself, because I was told that it was safer than ruing a lightweight wallet, and, by the way, it works fine. I mean, I´m using my computer for dealing with money. I use as well my browser to coect to my local bank account. So I m little conceed about what kind of safety measures should I run to stay as safe as possible when coected to the inteet.

I m coected to the inteet using a Router VG 8050 Comtrend that was provided by my phone company. ( Optical Fiber ).The coection was like automatic, nothing was configured neither on the modem or computer, the technician just came to my house and... "plug and play".

Gathering some information I leaed about a firewall called UFW, that would block incoming coections, so I suppose I should run it on to stay safer.

Little do I know about inteet configuration and security but these are the ports I need to keep opened.

Default Bitcoin network protocol listen port is 18333 (testnet) and 8333 (standard bitcoin network ).

Default RPC coection port 18332 (testnet) and 8332 ( standard bitcoin network ).

I need as well the torrent client Transmission and Thunderbird working fine. I don´t know if I should keep any other ports opened apart from the ports above. Of course I need Firefox working fine and loading all kind of websites.

Should I block all the incoming coections ruing

sudo ufw enable?. And then, unblock the desired ports with?

sudo ufw allow 18333

sudo ufw allow 8333 etc...

Is there any ports I have to keep opened for Transmission and Thunderbird?.

Browsers will keep on loading pages after doing this?.

Do you recommend UFW or is there any other firewall I should know about?.

Should I configure something else on my router or O.S to stay as safe as possible when coecting my computer to the

inteet for moneytransfer?.

What kind of things should I check from my inteet coection and how?.

Thanks in advance to those who could say something back. Kind Regards!.