new to ssh. what can I transfer and how to block with firewall

hello,

I recently set up ssh on two linux mint computers in the same home and connected to the same router, both mine.  and I have possibly a couple of questions.

first, is ssh capable or, better yet, ideal for moving videos (I saw a youtube vid that stated it was only worked for text)?

if it IS ideal for moving videos, how would I go about configuring my ufw firewall (terminal commands are ok) so I can block (not allow) any other computer besides mine to connect via ssh?

here I am connecting for the first time.  I am unable to use IP address (I don't know how, when I tried it didn't work) so I resorted to using the computer hostname. 

ed@ed-umaNOTsecure:~$ ssh ed@ed-To-be-filled-by-O-E-M.

thank you

hi cryptodan

I am actually trying to avoid having to plug in flash drives regularly to move lots of files.  if I don't write a post it note that says what I've done and when, I lose track.  if I can transfer all my files in one motion this would be an improvement from an organizational standpoint.  one computer I use for car stuff, the other for employment stuff, etc, etc,.  with ssh I could be sending different groups of files in both directions as needed.

excuse me if I have the terminology wrong, if sftp, rsync and scp take over once the connection is established.

if it can't move video files, it's not going to be worth it and I'll go back to plugging in external storage. 

1. can this new method of file tranfer move lots of data at a reasonable speed (mostly video)?  if yes,

2. how can I make a ufw rule to block all other computers?

thanks

How do you connect all the other machines to your network?

How many machines are in your network?

Will you be doing the transfer remotely as well?

How do you connect all the other machines to your network?

wired.  there is a router the computers are wired into and a modem before that.  all wired.

How many machines are in your network?

just the two

Will you be doing the transfer remotely as well?

yes, if I'm able to

is this type of data transfer reasonably capable?

Yes it is, as I have been doing it for the last 21 years.

Protocols in use will be SSH, SFTP, and SCP.

SCP Examples - https://haydenjames.io/linux-securely-copy-files-using-scp/

SFtp Examples - https://www.tecmint.com/sftp-command-examples/

you can use port forwarding on router to hide your ssh server from external scans and setup sshd to not broadcast its header information.

in specific

hide your ssh server from external scans and setup sshd to not broadcast its header information.

I am looking through the program and I don't see PORT FORWARDING, but I do see FORWARDING.  when I click on it it lists:

virtual servers

port triggering

DMZ

UPnP

I'm checking through the info given, but so far I don't see anything promising

What router do you have?

this is weird.  I thought I already posted this.  it said 'saving post' but never did save.  I had to repost.

TP link

TL-R860

follow this http://www.pcwintech.com/port-forwarding-tp-link-tl-r860-tp-link-firmware

thanks cryptodan