Tutorial · Tableau Basics

Tableau Basics Explained for Complete Beginners

SECTION 01Tableau basics: connecting data and the workspace

Everything in Tableau starts with a data source. For practice, an Excel or CSV file is enough; at work you may connect to databases or cloud sources. After connecting, the Data Source tab shows a preview of your rows, and this is the moment to check that column names, data types and row counts look right. Then you open a worksheet, where the left pane lists your fields, the centre is the canvas, and shelves such as Rows, Columns, Filters and the Marks card control what you see. Tableau Public is free for learning, though anything you publish there is visible to everyone, so use only public or sample data.

order_id,order_date,region,category,sales,profit,quantity
1001,2026-01-05,North,Furniture,12000,1800,3
1002,2026-01-07,South,Technology,25000,4200,2
1003,2026-01-09,West,Office Supplies,1800,300,10
1004,2026-02-02,North,Technology,31000,5100,4
1005,2026-02-14,East,Furniture,9000,-600,2
# Save as sales_practice.csv and connect via Text file

After connecting, check:
☐ Row count matches the source file
☐ order_date is a Date, not a String
☐ sales and profit are numbers (green, #)
☐ No unexpected nulls in key fields
☐ Field names are readable (rename if needed)

SECTION 02Dimensions, measures and your first charts

The single most important Tableau idea is the difference between dimensions and measures. Dimensions are descriptive fields you group by, such as region, category or customer name. Measures are numeric fields Tableau aggregates, such as sales or quantity, usually with SUM by default. When you drag a dimension to Rows and a measure to Columns, Tableau groups and sums for you — that is a bar chart. Dates can act as both: discrete parts like month names, or a continuous timeline. Learn a few chart types well and pick each one for the question it answers.

1. Drag Category to Rows
2. Drag Sales to Columns → SUM(Sales) bars appear
3. Click the sort button on the toolbar (descending)
4. Drag Profit to Colour on the Marks card
5. Drag Sales to Label to show values
6. Rename the sheet: "Sales by Category"

1. Drag Order Date to Columns
2. Right-click the pill → choose continuous Month
3. Drag Sales to Rows → a line appears
4. Drag Region to Colour to compare regions
5. Analytics pane → drag Trend Line onto the view (optional)
6. Rename the sheet: "Monthly Sales Trend"

SECTION 03Calculated fields, filters and dashboards

Once basic charts make sense, calculated fields let you create new measures and categories from existing data — profit ratio, order size bands or year-over-year change. Filters narrow what a view shows, and showing a filter to users lets them explore. A dashboard combines several worksheets on one screen, with filters and actions that connect them so clicking one chart updates the others. Keep dashboards focused: one clear question, a few charts and readable labels. Then publish to Tableau Public to share a link or add it to your portfolio.

// Profit Ratio (format as percentage)
SUM([Profit]) / SUM([Sales])

// Order Size band (row-level)
IF [Sales] >= 20000 THEN "Large"
ELSEIF [Sales] >= 5000 THEN "Medium"
ELSE "Small"
END

// Loss-making flag
IF SUM([Profit]) < 0 THEN "Loss" ELSE "Profit" END

1. New Dashboard → set size (e.g. Automatic or 1200 x 800)
2. Drag "Sales by Category" and "Monthly Sales Trend" onto it
3. Add a Region filter → Apply to all worksheets using this data source
4. Dashboard → Actions → Add Action → Filter (source: category chart)
5. Add a title that states the question
6. File → Save to Tableau Public (sample data only)

SECTION 04Tableau practice templates

Use these templates to practise each basic skill on purpose. Rebuild them with a new public dataset every week until the steps feel automatic.

Day 1: Connect a CSV, check data types
Day 2: Five bar charts answering five questions
Day 3: Line charts with continuous and discrete dates
Day 4: Maps and scatter plots
Day 5: Three calculated fields
Day 6: Filters, parameters, sorting
Day 7: One dashboard with an action; publish to Tableau Public

Question: ____
Chart type: ____ (why?)
Dimension(s): ____
Measure(s): ____
Filters: ____
One-sentence takeaway: ____

☐ Title states the question
☐ 3-5 charts, each with a clear purpose
☐ Filters labelled and applied to the right sheets
☐ Consistent colours across charts
☐ Tooltips cleaned up
☐ Totals checked against the source data

SECTION 05Tips for learning Tableau basics

Keep these points in mind as you practise:

• Check data types first — dates and numbers must be right.
• Know dimensions vs measures — it explains most behaviour.
• Choose charts by question — not by looks.
• Aggregate before dividing — for correct ratios.
• Publish safely — Tableau Public is public.

SECTION 06Interview Q&A — Tableau Basics

SECTION 07Test yourself — Tableau Basics quiz

SECTION 08Frequently asked questions

SECTION 09Related reads