Information used to run and improve Excel Practice Lab
This policy explains how Excel Practice Lab handles information when you use exercises, create an account, synchronize learning records, send feedback, or use other website features. Last updated: July 31, 2026.
Information we may process
- Account information: email address, display name, password hash, and session status when you register or sign in. We do not store passwords in plain text.
- Learning records: exercise starts, answer checks, completion status, review records, and synchronization status so you can continue learning.
- Usage and technical information: page paths, event names, an anonymous session identifier, optional account identifier, browser information, request time, and server security logs.
- Messages you send: feedback text and optional contact details that you choose to provide.
How we use information
- Provide sign-in, learning-record synchronization, exercise review, and other requested features.
- Identify errors, protect accounts, prevent abuse, and maintain website reliability.
- Understand which exercises and guides are useful and decide what to improve.
- Reply to support, privacy, copyright, or content requests when contact details are provided.
Website analytics events are designed not to include formulas entered into practice sheets, plain-text passwords, or workbook contents. Please do not submit sensitive personal or business data in feedback.
Cookies, local storage, and advertising
Essential cookies may be used to maintain account sessions. Browser local storage may keep preferences, anonymous learning progress, and an analytics session identifier on your device.
The website uses Google Analytics 4 (GA4) to understand visits, referral sources, language preferences, and interactions with exercises across the Chinese and English sites. GA4 events do not include formulas entered in practice sheets, workbook contents, plain-text email addresses, or passwords. Consent signals and the privacy controls available in your region determine how Google tags operate. Learn how Google handles related information in the Google Privacy Policy.
The website may use Google AdSense or similar advertising services. Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to this website or other websites. Google's use of advertising cookies enables Google and its partners to serve ads based on those visits. You can opt out of personalized advertising in Google Ads Settings.
If other third-party advertising vendors or networks are enabled, they may also use cookies or comparable technologies under their own policies. You can review their privacy choices on their websites. Learn more about Google's advertising technologies in Google's advertising policies.
Retention and security
- Passwords are stored as hashes rather than plain text.
- Account sessions use httpOnly cookies where the service supports them.
- We retain information only as reasonably needed for operation, security, analysis, or legal obligations.
- We do not sell personal information.
Your choices
- You can browse public guides without signing in.
- You can clear cookies and local storage through your browser.
- You can use the Google consent controls shown in supported regions or clear cookies through your browser.
- You can use the contact page to ask about your account or a privacy concern.
- You can manage advertising preferences through the controls offered by your browser or advertising provider.