Well, due to curtsey of this forum I've come to realize that my network (My Xubuntu desktop directly (cable/LAN) connected through TP-link wifi to host router by cable/LAN) is quite insecure. I've done some research and installed GUFW on my desktop and turned it on to default profile settings. Now, after doing some further research I've come to realized that you can block inbound and outbound connections by identifying the IP addresses and so on..
What I would like to know is how to identify the correct ones? And how? Of course, not interrupting any network functioning and if possible future sharing using samba (work there is in progress as I'm still in process of reading things on subject of file sharing between machines on my network and main host router network). Well, you should get the picture from this.
I'm not sure if I'm making lot of sense but if you get where this newibe is coming from, do help me/point me in right direction