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Digital certificate can no longer be selected when logging in to a site (Edge)

Have you ever seen the following error message when using login with a digital certificate? The certificate you have selected is not available for this service. Please close all browser windows and try again. Internet ban...

2024.08.02

Edge

How to Disable the Copilot Icon in Excel (4 Simple Ways)

Many of you may have recently started seeing a "Copilot" icon like the one above in Excel. Copilot has many convenient features, but it can be annoying when it constantly pops up every time you select a cell. So, this time...

2025.07.12

Excel Functions

How to use the sheet protection function.

After you have created a great system or tool in Excel, do you ever have this fear when you want others to use it? What if someone accidentally breaks a formula... What if an important function is deleted? I only want to edit the cells I need, but...

2024.10.08

Excel Functions

How to set and remove sheet and book protection Excel (Excel)

If you are thinking about preventing Excel mishaps, this is a must! This article details how to set up and remove sheet and book protection. In fact, you can easily set it with a password. This article will help you protect your important data.

2025.06.06

Excel Functions

What does the error message "#VALUE!" mean and what can I do about it?

Error messages are unavoidable when dealing with Excel, and you may be surprised when they suddenly appear. Here are the meanings and countermeasures for these errors. As an example of preconditions, let's make a table like this...

2024.05.30

Excel Functions

How to display file extensions [Windows 11].

For the beginning computer user, there may be little trouble with file extensions not being displayed. However, once you have started to tinker with computers to some extent, there are situations where you may need to change the file extension or process a file differently depending on its extension, so this...

2024.10.08

Windows

How to Prefer Manual Fill to Conditional Formatting Excel (Excel)

Conditional formatting is a very useful feature that automatically fills in or changes formatting based on specified conditions. However, many of you may have experienced the problem that conditional formatting takes precedence over manual filling. In this article, we will discuss how to use conditional formatting...

2024.07.09

Excel Functions

How to Auto-Resize Excel Columns and Rows with VBA Macros (Copy-Paste Ready)

Struggling with cell misalignment or manual resizing in Excel? This article shows how to efficiently adjust row height and column width using VBA—solved in just a few lines of code by a seasoned macro expert.

2025.06.27

Excel Macro (VBA)

How to use the Spill function Excel (Excel)

I had neglected the "spill" feature implemented in Microsoft365 and Excel2021 for a while because I didn't really understand it, but when I tried it, I found it to be very useful. I found it to be very useful. Moreover, I thought that I could do a lot of things by applying this function...

2024.07.04

Excel Functions

How to Hide Sheet Tabs in Excel – Fast & Easy

A must for Excel system creators and those considering preventing erroneous operations. This article explains with images how to hide sheet headings to prevent unexpected operations. In fact, it can be achieved with only a simple option setting. This article will help you create safe Excel files.

2025.06.11

Excel Functions