Find your next workable step
Do I need advanced mathematics to begin?
No. Begin with arithmetic, percentages and careful definitions. Learn distributions, sampling and uncertainty before making inferential claims. Being able to explain a denominator is more immediately useful than applying an advanced formula you cannot justify.
Should I learn spreadsheets or SQL first?
Start by inspecting a small table in a spreadsheet, then reproduce the same result in SQL. Keeping the question stable makes the tool differences easier to understand. Follow the spreadsheet lesson and then the SQL lesson without changing the example records.
Do I need paid software?
No. LibreOffice Calc and SQLite can support the core exercises. Features and syntax vary, so check the documentation for your chosen tools. You can sketch the dashboard on paper before using a business intelligence application.
How should I handle a missing amount?
Keep it explicitly unknown unless there is evidence for a replacement. Report completeness and explain which calculations exclude it. A blank, a genuine zero and “not applicable” are different states and may require different treatment.
Why does my SQL total differ from my spreadsheet?
Compare row counts, duplicate handling, date filters, data types, missing values and join grain before changing the calculation. Work from the simplest comparable result and add one transformation at a time.
How much statistics do I need for dashboards?
Understand counts, denominators, mean, median, variability and the difference between description and causation. More advanced claims require appropriate design and methods. A dashboard is not an experiment merely because it compares two groups.
What makes a useful first portfolio project?
A small decision-focused project with a source, data dictionary, quality log, reproducible calculations, readable dashboard and qualified recommendation. The project guide provides an evidence-pack checklist and self-assessment rubric.
Does this site award certificates or guarantee employment?
No. It is an independent informational resource, not an accredited training provider, assessment authority or recruitment service. The self-assessment helps you identify revisions; it is not a professional certification.
Does the contact tool send my message?
No. It prepares text locally for copying or downloading. You decide whether to send it separately through your email application. Avoid putting personal records, credentials or confidential business data into a study question.