Shared WiFi and VPN and Tor?
 

If I share my WiFi in my house with two other people, is there any point in using Tor and a VPN?

IDK, depends. What's the relationship between these two/three completely distinct things anyway?

Just a a newbie, not in the know, I suspected that three people using the same Wi-Fi, would be using the same ISP and IP address and that it might defunct privacy over the net.

I guess it depends on what you want to accomplish.
You will not be hiding from law enforcement.
There are also extensive projects for mapping SSIDs such as https://wigle.net/

Hi, I am interested in security and privacy. So all I have is the safety of my firewall and apparmor? And Alpine Linux security if I set it up? What if I connect to the same modem via a cable? Or need I be the only one to be using the modem? Wi-Fi can be spied on, and multiple users gives away the IP address and I could be hacked and robbed...?

Two of us use Linux with apparmor and firewalls. But I want to avoid spyware and privately set up a website. And we purchase online, so keylogging is a danger.

For Privacy either TOR or VPN would be fine. That will limit the stuff a website can collect from you. And firewalls and the like is always a good idea.
I haven't used apparmor so I cant say anything about it.

Unfortunately, today most malware does not break in but it breaks out.
So connections are started from inside and goes out the firewall, not from the outside, in. Most people allow everything from the inside to go out.
Usually from malspam - that being users downloading stuff or clicking links or opening Office files.
Running Linux decreases your risk of getting malware quite a lot. :)

I would say you should be good with most firewalls if you dont click those mails that claims you can win iPhones and stuff.
And for privacy, VPN or TOR would be fine but I am not sure how needed they really are for most users.

One more time, it has to be said: do not do this over TOR.