The word "introduction" can mean an introduction to industrial controls, or an introduction to a new software package for people who already maintain machines. Both can be useful. Only one may fit where you are now.
Before buying a PLC course, ask the provider to describe the learner it expects on the first day.
Use a real prerequisite as a comparison point
Rockwell Automation's CCP146-EL fundamentals page lists basic Microsoft Windows tasks as a prerequisite and describes an introduction to Logix 5000 concepts, projects and controller communication.
That is one manufacturer's e-learning example, not a universal entry rule or a recommendation to purchase that course. Another class might expect an electrical background or experience with a particular controller.
Ask for the prerequisite in plain language: what should I already be able to explain or do?
Identify four parts of the offer
Write down the controller family, software name and version, access arrangement, and practice environment.
For access, ask whether software is included, whether your own computer is required and whether its operating system is supported. For practice, distinguish watching a screen recording, using a simulation, working remotely with equipment and attending a supervised physical lab.
Do not assume that a laptop purchase or software subscription is covered by tuition.
Ask about the first unfamiliar concept
A useful question is, "What happens if I do not understand inputs and outputs in the first lesson?" The response can tell you whether the course has explanations and support for beginners or expects those concepts to be familiar.
Ask for a sample lesson or a description of the first assessment. Does the learner explain what a simple example does, complete an assigned software task, or diagnose an established system? Those are different demands.
You are choosing an appropriate starting point, not proving that you already belong.
Keep classroom practice inside its boundaries
A training exercise does not authorize changes to a workplace controller. Ask how the class separates instructional equipment from production systems and what safety preparation precedes any physical work.
Use only the provider's approved learning environment. Do not connect course software to machinery at work or alter a live system to try out a lesson.
This article is about course selection, not instructions for programming or servicing equipment.
Choose the next course deliberately
Before enrolling, request a written answer to three questions: who is this for, what will I demonstrate, and what comes next?
If the course is too advanced, ask for the foundation it assumes. If it is appropriate, reserve time for practice and support rather than counting only the advertised lesson length.
Compare the industrial-maintenance overview, the distinction between production and maintenance training, and the program comparison worksheet.