General Knowledge
Required for every CDL class.
Explore lessonsA clearer way to study.
Understand your road to CDL.Learn it. Practice it. Move forward.
Start with the fundamentals. Understand how the truck works and why an answer is right. Plain-language lessons, English questions, and translations when you need them.
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7CDL / FIELD NOTES01—03
Connect the idea to the part
↗From the lesson to the truck: explore brakes and trailer connections.
82 lessons1,547 practice questions3 languages50 + DC States
01 / Study plan
Not sure where to begin?
Choose your goal to find the relevant study sections.
02 / Study guide
Explore the curriculum ↗Build your foundations
Start with General Knowledge. Add the sections for the vehicle you plan to drive.
Air Brakes
Needed to drive a vehicle with air brakes without an "L" restriction.
Explore lessonsCombination Vehicles
Needed for Class A (tractor-trailers).
Explore lessons03 / Endorsements
Then choose your specialty
Study the endorsement for your vehicle and cargo. Skills preparation has its own learning path.
Prepare for hands-on training ↗04 / States
Your state sets the details
Application requirements, testing languages, and official references in one place.
States ↗Information you can trace
Lessons identify their manual sections. State facts link to their sources. We distinguish study support, licensing requirements, and facts that still need checking.
Our editorial approach ↗