Learn how to format numbers in Thousands, Millions, and Billions in Excel and Google Sheets. Use number Formatting to convert numbers.

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

Next, tidy up the appearance of your text. Stick to clean, professional fonts like Calibri, Arial, or Times New Roman, and use consistent sizes—say 12pt for headers and 11pt for all other text. Align ...