The 15 Basic Excel Formulas Everyone Needs to Know

Overview

Learn how to add arithmetic, string, time series, and complex formulas in Microsoft Excel.

This walkthrough is written for practitioners who want a working result first and a clear explanation second. Every step is reproducible on a laptop.

What you will need

• A recent installation of the tools covered in this guide
• A terminal or notebook environment you are comfortable in
• About 13 minutes of focused time

Step 1 - Set up a clean workspace

Start from a fresh environment so nothing from a previous project leaks into your results. Confirm your versions before you begin: most confusing errors in this area come from a version mismatch rather than from the code itself.

Step 2 - Build the smallest working example

Solve the tiniest version of the problem first. Once the minimal case behaves the way you expect, scale it up one variable at a time so every failure is easy to attribute.

Step 3 - Verify the output

Check the result against a case where you already know the answer. When the two disagree, the difference tells you exactly which assumption to revisit.

Common pitfalls

• Silent type coercion changing results without raising an error
• Copying configuration from an older version of the tool
• Skipping validation because the first run looked correct

Where to go next

Extend this into your own project, then work through the related tutorials below to round out the topic.