Choosing an AutoCAD instructional text usually comes down to how closely it matches the release you're using, how clearly it explains commands, and what it costs. The AutoCAD 2021 Instructor paperback targets that exact version, and this used copy is listed at $23.85.
Quick Verdict
If you're learning AutoCAD 2021 and want a structured, textbook-style walkthrough, this trade paperback is a practical buy. The price is modest for a book this size, and the description says it has all pages and legible text. Expect minor signs of wear because it's a used item.
Who It Suits
This book fits self-learners and students who want a detailed instructional reference that follows AutoCAD 2021. It can also work for instructors who prefer a consistent class text. The large page count suggests thorough coverage, and the title lists Shawna Lockhart and James Leach as authors, giving it a familiar place in AutoCAD education.
What Stands Out
AutoCAD 2021 Instructor (Trade Paperback)

The format is a trade paperback, and it's a big volume at 10.8 by 8.5 by 1.6 inches, so it's designed for desk-based study rather than tossing in a bag. The very-good condition means it has seen limited use, all pages are included, and the text is legible. At $23.85, the price is a key selling point for a book that can be a core learning resource.
Meaningful Trade-offs
The most obvious trade-off is the 2021 focus. If you're using a different AutoCAD release, the interface and commands shown here may not match what's on your screen. Also, because this is a used copy, you may encounter slight markings or highlighting, which the description flags honestly. The large paperback size is another practical consideration; it's not a portable quick-reference guide.
Bottom Line
The AutoCAD 2021 Instructor paperback is a sensible choice for anyone who wants a low-cost, structured guide to that specific AutoCAD version. It won't be mistaken for a brand-new book, but at this price and condition, it's a solid way to work through AutoCAD 2021.