Reflection creates a mirror image of the object below the original. This effect creates a blurred, semi-transparent clone of the original object that resembles an object reflection on water or class. It is affected by two factors:

If you show historical data, creating a timeline chart is often more informative. Several different predefined SmartArt graphics can be used for timeline charts.
This tip shows simple steps for creating a simple and informative timeline using Microsoft logo design changes (see https://en.wikipedia.org/wiki/Microsoft#Logo).

When you create a presentation of the project, task, or innovation, it will be useful to show the project schedule calendar. You can create a Gantt chart, for example, in Excel and just add it to your PowerPoint presentation (see How to create a perfect Gantt chart).

A flowchart or flow chart usually shows steps of the task, process, or workflow. Word for Microsoft 365 provides many predefined SmartArt templates that you can use to make a flowchart, including visually appealing basic flowchart templates with pictures. However, if you have a process with a tangled flow or you need a custom layout, you can build a complex flowchart in Word using rectangular, diamond, round, and other box types.

Today a lot of information is shared, legally or not. Many people use shared information from Internet or from other sources, but now all information you want to share. Microsoft Word, Excel, and PowerPoint files often contain hidden or personal information, such as revisions or comments, that others can access. Depending on the nature of the information, this could place you in an embarrassing or even compromising position.

Some popular presentations show slides that mimic blackboards, and charts or diagrams look drawn with chalk. Here you will find some tricks that help to create slides like this:

To protect your spreadsheet, Excel proposes the following options:

To create an effective presentation that contains equations, you need to use a special mathematical style. This style involves using special characters and syntax, a special type of line breaks, delimiters, and requirements for superscripts and subscripts.

Protecting a workbook is different from protecting the Excel file with a password to prevent reading/writing or locking the spreadsheet elements to prevent editing. Workbook protection forbids other users to add, move, rename or delete worksheets and defends against viewing hidden worksheets or hiding worksheets.

Color code is a perfect way to identify content and draw attention to it. In Excel, you can easily change the colors of one or more spreadsheet tabs (see how to group multiple sheets).