How to Install SpamAssassin on Fedora?

As part of my nerdy home system, I have a Fedora Linux server, which is
my file server, my web server and my mail server. For almost 20 years,
my incoming mail was scrubbed by a spam filtering service operated by my
friend in Switzerland, but he is now retiring, so I need to do this for
myself now.

I figure the tool of choice is spamassassin, but where do I find a
reasonably simple how-to guide? I assume I cannot just
    dnf install spamassassin
    systemctl enable spamassassin.service
    systemctl start spamassassin.service

But what more do I need to do?