Good morning Bob,

Thanks for your questions.

I created PLC Basics Second Edition for those with little to no experience, so that would likely be the best course to start with:

https://theautomationschool.com/courses/plc-basics-second-edition-course/

On your second question, I designed my online courses to have no expiration date specifically so you can refer back to any of the lessons in any order as needed. I also plan to add more new lessons to all of the extended editions this year at no additional charge 🙂 (currently PLC Basics Second Edition only comes in the extended version)

Thanks again for your questions,

Shawn Tierney,
Instructor, The Automation School