Big Data and AI

Lesson 2.1 – Entering Data In this lesson, you will learn how to enter clean and structured data in Excel. Correct data entry is essential for accurate calculations, sorting, filtering, and all types of data analysis. Excel recognizes different types of data such as text, numbers, dates, and times, and each behaves differently inside the worksheet. 1. Entering Text Text is used for labels, names, categories, and descriptions. Excel aligns text to the left by default. Examples: Product A Customer Name Category To enter text, click a cell and type. Press Enter to confirm. 2. Entering Numbers Numbers are used for quantities, prices, percentages, and calculations. Excel aligns numbers to the right by default. Examples: 150 3.75 -20 Avoid adding spaces or symbols (except decimal separators), otherwise Excel may treat the value as text. 3. Entering Dates and Times Dates and times must follow a valid format...

Lesson 1.4 – Data Types in Excel: Text, Numbers, and Dates Excel interprets data differently depending on its type. Understanding how Excel classifies text, numbers, and dates is essential for accurate calculations, sorting, filtering, and data analysis. This lesson explains how each data type works and how Excel behaves when processing them. 1. Text (Strings) Text is any content that Excel does not recognize as a number or date. Text is aligned to the left by default. It is commonly used for labels, names, categories, and descriptive information. Examples of text: Product A January Invoice #4521 ABC123 Even numeric-looking values may be treated as text if they contain leading zeros, spaces, or non-numeric characters. 2. Numbers Numbers are values Excel can use in calculations. They are aligned to the right by default. Numbers can represent quantities, prices, percentages, measurements, or any numeric data. Examples of ...

Lesson 1.3 – Workbooks, Worksheets, Cells, and Ranges This lesson introduces the fundamental structural elements of Excel: workbooks, worksheets, cells, and ranges. Understanding these components is essential before working with data, formulas, or analysis tools. The concepts explained here form the foundation of all Excel operations. 1. Workbooks A workbook is the Excel file itself. Each workbook can contain one or more worksheets. Workbooks are used to organize related data within a single file. For example, a financial model, a budget, or a project plan is typically stored in one workbook with multiple worksheets. Examples of workbook names: Budget_2024.xlsx Sales_Report_Q1.xlsx Inventory_Tracking.xlsx Workbooks can be saved in different formats, such as .xlsx (standard), .xlsm (with macros), or .csv (comma-separated values). 2. Worksheets A worksheet is a single page inside a workbook. Worksheets are used to separate d...