Useful lessons. Clear sources. Honest limits.
Who publishes LearnLab?
LearnLab is published by Excel Keys, the analytics and education brand led by Jitendra Rao. Its established work focuses on MIS reporting, Excel dashboards and automation. Those business-data examples shape this learning hub.
This site does not claim that its founder has reviewed every Python or SQL lesson, or that the courses carry an external accreditation. Self-paced completion certificates are available; these do not represent an accredited qualification. Technical examples are learning materials, not professional advice.
How these lessons are made and checked
The initial lessons, translations, worked examples and application were developed with AI assistance. Each Python and SQL lesson includes a concrete example, an exercise and a worked answer so readers can test the idea themselves.
The 32 Python reference solutions have been executed in the Pyodide Python runtime, and the 32 SQL reference solutions in SQLite. Automated execution helps find mistakes but does not establish that every possible solution or explanation is correct. No independent expert review is claimed.
We document substantive changes, use official language references, and provide an error-reporting route. The dates on these pages reflect this release's content changes; they are not refreshed simply to appear new.
Why this learning hub exists
LearnLab helps beginners move from spreadsheet questions to programming and data-query skills. Lessons are free to access, with English, Hindi and Hinglish explanations, browser practice, optional answer help and progress remembered on the learner's device.
The courses introduce practical topics from basics to more advanced concepts. They are not an exhaustive replacement for official documentation, job experience, or project work.
Reference shelf
Corrections and contact
If an example fails or an explanation is unclear, send the lesson URL, your code, the expected result and the actual result to info@excelkeys.in. Use fictional sample data and remove passwords or private information. Reporting opens your email app; it does not automatically send a message.
You can also use the Excel Keys contact page. Submitted corrections need verification; there is no promised response time or claim that every submission is an accepted correction.
Free learning, advertising and sponsorships
Free access refers to the lessons, quizzes, practice tools, final test and certificate. To keep them free, Excel Keys may show clearly labelled advertising, including Google AdSense, on public pages. Advertising stays separate from lesson answers, Run buttons, the final test and course navigation.
Excel Keys also welcomes sponsorships and collaborations with brands that help learners, such as sponsored practice projects, YouTube tutorials, templates and workshops. Sponsored content is always labelled, sponsored links use rel="sponsored", and sponsors never influence answers, test scores, unlocks or certificates. Read how it works on Partner with Excel Keys.
We do not promise an advertising-free website forever. Any future advertising should be covered by the site's LearnLab privacy policy and browser storage policy, including consent choices where applicable. Nothing here represents AdSense approval.
Your learning data
Completed steps and preferences are stored in this browser, not an account database. Practice code and temporary SQL data reset on reload, page exit or inactivity. Browser data can be cleared or evicted; export a progress backup if you want to keep one. Read learning data and privacy details.