Overview
This page walks through a first session: creating an account, picking a course, reading a question properly, and finding your way back to it later.
1. Create an account
Sign up with email and a password, a magic link, or a passkey — all three end at the same account. If your organisation provisioned a seat for you, accept the invitation from the email instead; that attaches you to the organisation and to whatever plan it holds, so you should not buy anything yourself.
After signing up you are asked for a display name and, optionally, an avatar. Everything else about your account is editable later under Settings → General.
2. Pick a course
The course switcher in the sidebar moves between WinSystemDesign, WinAI, WinCloud and WinOps. Switching courses changes the whole sidebar: each course only lists the content types it actually has.
If you are preparing for a specific interview loop, pick the one course that matches it and ignore the others. The libraries are large enough that spreading across four is usually worse than finishing one.
3. Read one question end to end
Question pages are the centre of the product. They are long on purpose — a question is a full walkthrough, not a prompt with an answer underneath.
A typical question moves through:
Requirements — functional and non-functional, with the clarifying questions you would actually ask an interviewer.
Estimates — traffic, storage and bandwidth, with the arithmetic shown rather than asserted.
The design — the high-level architecture, then each component in turn, with diagrams you can open full-screen.
Trade-offs — where the design would break, and what you would choose differently under different constraints.
Follow-ups — the questions an interviewer asks once the whiteboard is full.
Read one all the way through before skimming several. The follow-ups are where most loops are actually decided.
4. Use the short-form material as revision, not as study
Cheat codes, quick tips and pitfalls are compressed. They are useful once you already understand the material, and misleading if you start there — they omit the reasoning on purpose so they stay skimmable.
A reasonable rhythm is: questions and concepts while you are learning, quizzes and flash cards to check retention, cheat codes and pitfalls the day before.
5. Keep your own notes
My Notes collects notes you write against any piece of content, across the whole library, in one place. Notes are attached to the item, so a note you wrote on a question shows up when you return to it months later.
What is free
Every course keeps a fixed set of items open on the free tier — complete items, not previews. You can read a whole question, work a whole quiz and browse a whole concept without paying, which is enough to judge whether the format suits you.
Everything else shows a locked page naming the tier that would open it. See Plans and access for the exact rules.