Jason Dion's CompTIA Security+ Complete Course & Practice Exam is the highest-rated Security+ prep on Udemy with over 200,000 enrollments. Dion sells the complete course and practice-exam pack separately on Udemy; direct bundles can include labs and different support terms. Check the exact listing. That changes the "is it enough?" answer significantly. The honest answer: yes, for most candidates—but only if you use it correctly. This guide breaks down exactly what Dion covers, what he doesn't, and the specific candidate profiles that need to add something extra.
For most candidates, Jason Dion's course alone (lectures plus his practice exams) is enough to pass Security+ on the first try—provided you treat his practice tests as a learning tool, not just a measurement. Use fresh practice questions to find weak topics; no practice percentage proves that you will pass the certification exam.
What the Dion Course Actually Covers
Dion's Security+ course runs 20+ hours of lecture, organized by exam objective. Unlike Messer's objective-by-objective rapid-fire style, Dion teaches concepts in narrative chunks with real-world analogies. Dion sells the complete course and practice-exam pack separately on Udemy; direct bundles can include labs and different support terms. Check the exact listing. Use fresh practice questions to find weak topics; no practice percentage proves that you will pass the certification exam.
Where Dion Alone Is Not Enough
Three candidate profiles need supplements. First, complete beginners with no IT background: Dion assumes baseline networking and OS literacy. If you don't know what a subnet mask or process is, watch Professor Messer's Network+ videos first. Use fresh practice questions to find weak topics; no practice percentage proves that you will pass the certification exam. Third, candidates who want hands-on lab experience: Dion's PBQ simulator is good but limited; supplement with TryHackMe's free Pre-Security path or a the current listed price per month subscription.
The Formula First-Time Passers Use
Use this as editorial study guidance, not measured candidate-outcome research. Each subsequent practice exam should be preceded by re-watching lectures on weak domains. Use fresh practice questions to find weak topics; no practice percentage proves that you will pass the certification exam.
Pro Tips
Buy Dion's course only when Udemy runs a sale (the current listed price), never at the the current listed price list price.
Take practice exams in the morning to mimic exam-day conditions; you'll be sharper.
Use Dion's downloadable notes as a final-week refresher, not a primary study tool.
Use fresh practice questions to find weak topics; no practice percentage proves that you will pass the certification exam.
Cross-reference any missed question against Professor Messer's free video on that objective for a second explanation.
Common Mistakes to Avoid
Treating practice exams as measurement only—the review pages are where the real teaching happens.
Watching lectures at 2x speed without taking notes; comprehension drops sharply above 1.75x.
Skipping the "test-taking strategies" module thinking it's filler—it has the only PBQ approach Dion teaches.
Dion sells the complete course and practice-exam pack separately on Udemy; direct bundles can include labs and different support terms. Check the exact listing. Spread them out so you can re-watch lectures between attempts.
Buying additional Dion practice tests from other platforms—the 6 in the main course are sufficient if used right.
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