There is not a specific tutorial for creating access rules.
the basic concept of the access rules is to add conditional to determine the site access based on variables.
for example, by default the authenticate user server behavior creates a session variable that contains the users ID.
you could edit the authenticate user server behavior on the sessions tab to save other user column in session as well, lets say you had a user gorup column and wanted to create user level access. you would edit the authenticate user beahvior to save the user group as a session variable, then create an access rile to use the user group session
in the access rule, add a condition as:
for the Value, click the lightning bolt icon and select the user group session
for the criteria select "="
for the comparison enter 1
this will create a rule to allow access if the user group session has a value of 1
the double option in tutorial contains an example of setting an access rule in the Create the restrict access rule section: