[ridgeback]

I do not know if I already have BBforums installed
I installed latest WP version
and then Buddypress standard theme.

The “pages” screen of BP: presents also a Forum page
but this does not appear in the website
In the website tabs I have the “groups” tab

Is the current configuration running BB groups?
or is it running Buddypress groups?

[@mercime]

Have you read https://codex.buddypress.org/getting-started/installing-group-and-sitewide-forums/ ?