Big Data and AI

Lesson 6.3 – Find and Replace / Go To Special Excel provides powerful tools to help you locate, modify, and select specific data quickly. Find and Replace allows you to search for text, numbers, formats, or formulas and replace them instantly. Go To Special helps you select specific types of cells, such as blanks, formulas, errors, constants, and more. These tools are essential for data cleaning, auditing, and fast navigation. 1. Why These Tools Matter When working with large datasets, manually searching for values or selecting specific cells is slow and error‑prone. These tools help you: Quickly locate specific values or text Replace repeated errors or outdated information Find and fix formatting inconsistencies Select only the cells you need (e.g., blanks, formulas, errors) Audit spreadsheets more efficiently They are essential for professional data cleaning and quality control. 2. Find (Search for Values) Where to find it: ...

Lesson 2.5 – Basic Data Cleaning Clean data is essential for accurate calculations, sorting, filtering, and analysis. Even small issues—extra spaces, inconsistent capitalization, or unwanted characters— can cause formulas to fail or produce incorrect results. In this lesson, you will learn simple but powerful tools to clean data quickly using Excel functions. 1. Why Data Cleaning Matters Raw data often contains problems such as: Extra spaces before or after text Inconsistent capitalization Non-printable characters from imported files Mixed formats (text that looks like numbers) Cleaning data ensures consistency and prevents errors in formulas and analysis. 2. TRIM – Remove Extra Spaces TRIM(text) removes extra spaces from text, leaving only single spaces between words. Example: Original: “ Product A ” Formula: =TRIM(A1) Result: “Product A” TRIM is essential when working with imported or manually typed data. ...