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Data Analytics Guides & Tutorials
From Excel to dashboards — roadmaps, tool comparisons, data cleaning, KPIs and business analytics for the modern data analyst.
Data Analytics articles
Top Free Tools for Data Analysts in 2026
The free tools a data analyst can build a complete toolkit from, each checked against its own licence or pricing page: spreadsheets, SQL databases, Python, R and notebooks, data cleaning, dashboards and BI, visual workflows and version control, with the catch in each option and starter kits for different situations.
Data Analyst Interview Questions and Answers, Part 2: The Metric Investigation Case
One interview round trips up more analysts than SQL: the metric investigation case. 'Cancellations went up six points. Why?' This guide works one real case end to end on public hotel booking data, showing the five steps interviewers look for, from checking the data to splitting mix from rate and finding the driver.