First a question. What is the most effective way to restrict a page to logged in users or users with a particular role?Do I have to use a plug-in or is the good code out there that I can find and use to do the job? Which is most efficient?

Next let me say thank you to the members of this sub for invaluable tips and information provided in the past. Though I have used WP since it's early b2 fork days I have not kept up with all the changes to the infrastructure so I appreciate being able to ask questions here to upgrade my knowledge.
Thanks