I need to add a note here because the security of qubes is often mistaken for privacy. And I want people to be aware of this.
Having different qubes (although great for security) does little for privacy. Through fingerprinting websites can track you across different qubes (beacuse they are so similar).
The moral of the story is that if you want privacy you need to use qubes based on whonix-ws-15 and whose netvm is sys-whonix. For a lesser degree of privacy you can setup a vpn ProxyVM and then a qube with a browser with some privacy addons.
Recommended reading: FAQ Qubes | What about privacy in non-Whonix qubes?