How to Back Up an iPhone to iCloud
Back up your iPhone to iCloud in iOS 27 or iOS 26: turn on iCloud Backup, use Back Up Now, confirm it worked, and fix not...
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How to Insert a PDF into Word
Insert a PDF into Word as an embedded object or icon, as editable text with PDF reflow or Text from File, or as page images, on...
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Excel224 guides
- How to Sum a Column in Excel
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- How to Use Conditional Formatting in Excel
- How to Use INDEX and MATCH in Excel
- How to Use COUNTIF in Excel
- How to Remove Duplicates in Excel
Recently published
How to Turn Off the Firewall in Windows 11
Turn off the firewall in Windows 11 from Windows Security, Control Panel or a command, allow one app instead, and turn the firewall back on safely.
How to Recover Recently Deleted Photos on iPhone
Recover recently deleted photos on iPhone in iOS 26 from Recently Deleted, iCloud.com or a backup, plus what to try once the 30-day window has passed.
How to Lock Cells and Protect a Sheet in Excel
Lock cells in Excel by unlocking the cells people fill in, then turning on Review > Protect Sheet. Covers formulas, passwords, edit ranges, Mac and web.
How to Turn On Mobile Hotspot in Windows 11
Turn on Mobile hotspot in Windows 11 from Settings or Quick Settings, change the hotspot name and password, connect devices, and fix a grayed-out switch.
How to Hide Photos on iPhone
Hide photos on iPhone in iOS 26 and iOS 27: use Hide in Photos, open the locked Hidden album, unhide pictures, and remove the album from view.
How to Make Columns in Word
Make columns in Word with Layout > Columns: two or three columns, columns for part of a page, column breaks, a line between, and fixes on Mac and web.
How to Turn On Night Light in Windows 11
Turn on Night light in Windows 11 from Settings or Quick Settings, adjust its strength, set a sunset-to-sunrise schedule, and fix a grayed-out toggle.
How to Block a Sender in Outlook
Block a sender in Outlook with steps for new Outlook, classic Outlook, Outlook.com and the phone app, plus how to block a domain and unblock someone.
How to Use Conditional Formatting in Excel
Learn how to use conditional formatting in Excel with built-in rules, data bars, color scales, formula rules you can copy, and fixes for common problems.
How to Use Virtual Desktops in Windows 11
Learn how to use virtual desktops in Windows 11: create, switch, rename and close desktops, move apps between them, and fix shortcuts that don't work.
How to Create a Contact Group in Outlook
Create a contact group in new Outlook, classic Outlook or Outlook on the web, email it, edit or delete it, and see when a Microsoft 365 group fits better.
How to Insert a Checkbox in Word
Insert a checkbox in Word: clickable boxes from the Developer tab, printable box bullets, checkbox symbols and web checklists on Windows and Mac.
How to Fix No Sound in Windows 11
Fix no sound in Windows 11: pick the right output device, check the Volume mixer, run the audio troubleshooter, and update or roll back the audio driver.
How to Share Your Calendar in Outlook
Share your calendar in new Outlook, classic Outlook, Outlook on the web or Outlook.com, publish an ICS link, and pick the right permission level.
How to Use INDEX and MATCH in Excel
Learn how to use INDEX and MATCH in Excel with step-by-step examples, two-way and multiple-criteria lookups, and fixes for #N/A and wrong results.
How to Fix Wi-Fi Not Working in Windows 11
Fix Wi-Fi not working in Windows 11 with quick checks, the network troubleshooter, driver and power fixes, network commands, and network reset.
How to Create Rules in Outlook
Create rules in Outlook to sort email automatically, with steps for new Outlook, classic Outlook and the web, plus server vs. client-only rules.
How to Insert Footnotes in Word
Learn how to insert footnotes in Word on Windows, Mac, the web and mobile, plus how to change numbering, convert to endnotes and delete footnotes.
How to Fix 100% Disk Usage in Windows 11
Fix 100% disk usage in Windows 11: find the cause in Task Manager, then use safe Microsoft-documented fixes for Search, SysMain, updates and drive errors.
How to Schedule an Email in Outlook
Schedule an email in Outlook with Schedule send in new Outlook, the web or mobile, or Delay Delivery in classic Outlook, plus how to edit or cancel it.
How to Use COUNTIF in Excel
Learn how to use COUNTIF in Excel with examples for text, numbers, dates and wildcards, plus COUNTIFS, OR logic and fixes when COUNTIF returns 0.
How to Use Phone Link in Windows 11
Set up Phone Link in Windows 11 with an Android phone or iPhone, then text, call and see notifications on your PC. Includes what works on each phone.
How to Recall an Email in Outlook
Recall an email in new or classic Outlook, on the web, Mac or phone. See which accounts support recall, how cloud recall works, and how to read the report.
How to Do a Hanging Indent in Word
Learn how to do a hanging indent in Word with Ctrl+T, the Paragraph dialog or the ruler on Windows, Mac and the web, plus fixes for indents that break.
How to Use Storage Sense in Windows 11
Learn how to turn on Storage Sense in Windows 11, choose what it deletes and when, free up OneDrive space, run it now, and fix common problems.
How to Set Up Automatic Replies (Out of Office) in Outlook
Set up automatic replies (out of office) in new Outlook, classic Outlook and Outlook on the web, plus a rule for Gmail or IMAP accounts and fixes.
How to Use Windows Sandbox in Windows 11
Turn on Windows Sandbox in Windows 11 from Settings, Windows Features or PowerShell, test apps safely, lock it down with a .wsb file, and fix errors.
How to Remove Duplicates in Excel
Remove duplicates in Excel with the Remove Duplicates button, Advanced Filter, UNIQUE, COUNTIF or Power Query, plus fixes when Excel misses them.
How to Use Call Screening on iPhone to Screen Unknown Callers
Make unknown callers say who they are before your iPhone rings. Turn on Call Screening in iOS 26 or later, and filter unknown and spam calls.
How to Use PIVOTBY in Excel to Summarize Data by Rows and Columns
Build a PivotTable-style summary with one Excel formula. Use PIVOTBY with a worked example, then add totals, sorting, filters, and percentages.
How to Enroll in Windows 10 Extended Security Updates (ESU)
Keep getting Windows 10 security updates through October 12, 2027. Check eligibility, pick the free or $30 ESU option, and enroll from Windows Update.
How to Use TRIMRANGE in Excel for Dynamic Ranges
Use Excel TRIMRANGE to trim empty edges and build dynamic ranges. See examples, named ranges, blank-row limits, and common error fixes.
How to Use REGEXEXTRACT in Excel (Examples and Fixes)
Extract codes and patterned text with Excel REGEXEXTRACT. Learn match modes, capture groups, case options, and fixes with tested examples.
How to Use GROUPBY in Excel to Summarize Data
Summarize Excel data with GROUPBY. Follow a tested example, control headers and totals, filter source rows, and fix common formula errors.
How to Troubleshoot Car Technology Problems When Your Car Won’t Start
When a modern car won't start, start with the things the car's computers check before they let the engine run: the shifter must be in Park (or the clutch pressed...
Use Passkeys in Windows 11: Create, Sign In, and Manage
Create passkeys from supporting services, verify with Windows Hello, choose storage carefully, and manage local passkeys in Windows 11.
How to Turn Off Windows Studio Effects in Windows 11
To turn off Windows Studio Effects in Windows 11, open Windows Settings, find the camera section under Bluetooth & devices, select your webcam, and toggle off the specific effects you...
How to Turn Off Dynamic Lighting in Windows 11
To turn off Dynamic Lighting in Windows 11, open Start > Settings > Personalization > Dynamic Lighting and switch Use Dynamic Lighting on my devices to Off. The change applies...
How to Enable Dynamic Lighting in Windows 11
Do you want your PC's RGB lights to do more than just sit there looking pretty? Windows 11 now offers Dynamic Lighting, a super cool feature that lets you take...
How to Use Sudo in Windows 11
To use sudo in Windows 11, turn it on first: open Settings > System > Advanced, switch Enable sudo to On and approve the User Account Control (UAC) prompt. Then...
How to Record Your Screen with Snipping Tool in Windows 11
Ever wanted to capture what's happening on your computer screen? Maybe you need to show someone how to do something, or perhaps you want to save a quick clip of...
How to Open a Winmail.dat File on Windows 10
A winmail.dat file is not a broken attachment. It is a wrapper that Microsoft Outlook sometimes uses to package a message's formatting and attachments, and your email program couldn't unwrap...