Frequently asked questions

A short, practical book that takes you from zero to real, working skills in 50 pages or less. Every chapter comes with a quiz, flashcards and spaced-repetition practice, so you remember what you read instead of forgetting it a week later.

Yes. Chapter 1 of every book is free to read, with its quiz and flashcards, no sign-up needed. A free account saves your progress across devices.

The full web edition with every chapter's quiz, flashcards and practice, plus a PDF you can download and keep. Updates and corrections are included at no extra cost.

A learning path is a set of books in a sensible order for a goal, such as AI Engineer or Full-Stack Developer. A bundle gives you many books at once. If you already own some of the books, they're taken off the price at checkout. A path or bundle covers the books on sale when you buy it; books added later are sold separately. For smaller sets of books, see the book packs questions below.

In My library, also under Account → My books and the profile menu at the top right. Each book there has its web edition, quizzes, practice and PDF download.

On the Code page. Every book's files are there to browse, copy or download as one zip, and the book links to them where you need them.

No. The Code Playground runs code without installing anything, and works without an account. Python, JavaScript, TypeScript, SQL, PHP, Ruby, R and Lua run right in your browser. Go, Java, C#, C/C++, Rust, Kotlin, Swift and Dart run on our code server in a locked-down sandbox.

Use the Input box under the code in the Playground. Type each answer on its own line before you press Run: Python's input() (and reading input in the server languages) takes them in order, and the output shows each answer after its question, like a terminal.

Two or three books that go together, like Python Basics and Python Beyond the Basics, sold together for less. Two-book packs are $14.99 and three-book packs are $20.98. See them all on Book packs.

Yes. Build your own pack: pick any 2 books for 25% off, or any 3 or more for 30% off every book you pick.

A pack is 2 or 3 books on one topic, a cheap way to start. A learning path is every book you need for a job, such as AI Engineer, in the right order, up to 30% off. A series bundle is every book in a series that's on sale when you buy it, at one price.

No. Books you own are never charged twice. They come off the price of any pack, learning path or bundle, and you only pay for the books you don't have yet.

Yes. Everything you buy counts toward a bigger pack or a learning path, because the books you own come off its price. After a purchase we show you how much the rest of your closest path would cost.

Yes. Every book in a pack comes with its PDF, web edition, quizzes, flashcards and practice. You download the PDFs one by one from My library.

Nineteen books that take you from how a computer works to every objective on the CompTIA Security+® SY0-801 exam: seven background books, eleven core security books and the CompTIA Security+ SY0-801 Exam Prep book, plus two optional TCP/IP books. Follow them in order on the CompTIA Security+ SY0-801 Prep path, or get every Cybersecurity & IT book with the series bundle.

The objectives map lists every line item of CompTIA's official SY0-801 objectives and links each one to the book, chapter and section that teaches it.

Yes. The free diagnostic has 40 questions across all five exam domains, with an explanation after each answer. Answer the first 10 without an account, then create a free account to finish and get your score report by domain. Your answers carry over.

A free diagnostic test, a checkpoint after each core book, six timed 90-minute practice exams with hands-on tasks first (as on the real exam) and a gym of 60 performance-based tasks: 880 questions in all, each with an explanation and a link to the page that teaches it. The diagnostic is free for anyone with an account; everything else comes with the CompTIA Security+ SY0-801 Exam Prep book. Open them from Security+ practice.

No. Every question is written by FiftyPage. Real exam questions are confidential, and using leaked ones can cost you your certification.

No to both. CompTIA® and Security+® are registered trademarks of CompTIA, Inc. FiftyPage is not affiliated with, sponsored by or endorsed by CompTIA. You book and pay for the exam with CompTIA; the Exam Prep book explains how.

We can't promise a result, but the course covers every exam objective, and the practice exams show you where you stand. The practice score is an estimate on CompTIA's 100 to 900 scale, with 750 to pass.

After you finish a chapter, FiftyPage brings its questions back at growing intervals (for example after a day, then a few days, then a week) so they stick. Your due reviews appear on My learning.

Yes. Go to Account → Review schedule. Pick a different pace, or choose No schedule to stop scheduled reviews. You can still practice any chapter whenever you like.

Yes. On My learning, under the reviews, choose Clear what's due to take today's backlog off your list, or Start reviews over to begin again from zero. Neither touches your finished chapters, quiz scores or certificates.

Set a goal on My learning or in Account → Learning goal: a number of chapters or hours a week, using the quick choices or your own number. You'll see this week's progress, how much is left by Sunday, and when you'll finish your current book at that pace. The finish date counts each chapter's reading time plus a few minutes of practice. Weeks start on Monday, and you can change or remove the goal at any time.

Yes, gently. If you're behind midweek, you get a short message under the bell at the top of the site with your next chapter, and another when you reach your goal. Setting a goal also turns on the weekly progress email, unless you've already chosen otherwise; turn it off any time in Account → Email preferences.

Time you're actively using a book: reading, quizzes, practice, flashcards and examples, while you've scrolled, typed or clicked in the last minute. Your daily and weekly totals and your streak are in Your study on My learning.

Finish every chapter of a book and claim your certificate at the end of its last chapter; finish every book on a learning path for a path certificate. Find them all in Account → Certificates, where you can view, share or add each one to LinkedIn.

No. It shows that you completed a FiftyPage book or learning path. It isn't an accredited qualification, and our Security+ course certificates are not CompTIA certifications.

Yes. When you're signed in, your reading position, quiz scores, flashcards, reviews, goal and certificates follow you to any device.

Checkout is handled securely by Stripe. We never see or store your card number. Stripe emails you a receipt.

Prices are listed in US dollars. Depending on where you are, checkout may show the price in your local currency. Stripe adds any sales tax or VAT that applies where you live, and you see the full total before you pay.

Yes. Your first book is $4.99, any book you like. After that, books are $9.99 each, and packs and learning paths cost less per book. The $4.99 price applies to one single book, on your first purchase.

Yes. Every purchase has a 14-day money-back guarantee, no reason needed. Email hello@fiftypage.com from the address on your account and tell us what to refund. See the Refund Policy for details.

Email hello@fiftypage.com. Mistakes are always refunded, even after 14 days.

On the sign-in page, choose reset my password and we'll email you a reset link. You can also sign in with Google, or choose Email me a sign-in link instead.

Go to Account → Profile. Your name, email address and password can all be changed there. The other Account tabs hold your books, certificates, purchase history, learning goal, review schedule, email preferences and messages.

Go to Account → Profile, scroll to Delete my account at the bottom, type DELETE and confirm. This removes your account and all your learning progress straight away and ends access to anything you bought, so download any PDFs you want to keep first. It can't be undone. We keep order records only because tax law requires it.

Yes. Email hello@fiftypage.com from the address on your account and we'll send you a copy within 30 days.

Besides account emails, there are three kinds, and you can switch each one on or off under Account → Email preferences: Weekly progress (how your current book and goal are going), Your books (welcome and "your books are ready") and Learning tips and news. Every progress and tips email also has its own Unsubscribe link, which takes effect immediately and only turns off that kind of email.

Only account emails you need, such as sign-in links, password resets and purchase receipts.

Small updates go to Messages instead of your inbox: confirmation that we got a bug you reported, a note when it's fixed, and reminders about your weekly goal. Open them from the bell at the top of the site or Account → Messages. You can delete any message.

Click Cookie settings at the bottom of any page. Visitors in the EU, EEA, UK and Switzerland are asked before any analytics or advertising cookies are used.

We use it to run your account, save your progress, process purchases and improve the site. We don't sell it for money. The Privacy Policy has the full details, including your rights wherever you live.

Email hello@fiftypage.com or use the Contact page.

Thank you! Use Report a bug at the end of any lesson, under any quiz question, on the Playground, or at the bottom of every page. It sends us the page (and the question) automatically. If you're signed in, you'll get a message under the bell when it's fixed. You can also email hello@fiftypage.com. Every reader gets the fix.