Version number And nexcloud 7 (and php versions )

Hi
I see nextcloud 7 on the site and inthe application 27 etc. I installed things via installatron.
Can anybody say what version is the newest version and how does it hangs with cvloud 6 and cloud 7 ?

thanks

and about php:
https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html

Much luck,
ernolf