These are designed to provide finished examples of what pkt tracer can do.
If you want a tutorial here is a link to a free one provided by NetAcad
https://www.netacad.com/courses/packet-tracer/introduction-packet-tracer
There are worlds out there where the sky is burning, where the sea's asleep and the rivers dream, people made of smoke and cities made of song. Somewhere there's danger, somewhere there's injustice and somewhere else the tea is getting cold" Dr Who