Excel 365
Grouping and ungrouping sheets
Sheets can be grouped (connected) to facilitate creating or formatting two or more identical sheets. For example, you can create one sheet and copy it to two other sheets, or you can group three blank sheets and enter and format the content once-no subsequent copying is required.
Change the number of the most recently used workbooks
Having your 25 most recently used workbooks on the File tab, in the Open menu is handy, but you may find it's not enough. You can increase the number shown up to 50, and you can pin (fasten) particular workbooks to the menu so that they remain there even if you haven't used them recently.
Adding commands to the Quick Access Toolbar
Suppose you'd like to add a couple more commands to the Quick Access toolbar. Also, say you're a big fan of AutoSum. You can add the AutoSum button to the Quick Access toolbar, so you can quickly create and use AutoSum entries.
Creating Your Own Menu
Creating custom menus in Excel is a funny feature you can use to create groups of the options you use
most often and then plug them into the menu you name and use yourself.
How to generate series of dates
Often you'll want to insert a series of dates into a worksheet. The most efficient way to enter a series of dates doesn't require any formulas - just use Excel's AutoFill feature.
Using Solver
The Solver tool allows you to specify multiple adjustable cells and constraints on the values that the adjustable cells can have, generate a solution that maximizes or minimizes a particular worksheet cell, generate multiple solutions to a problem.
Goal Seeking
Goal seeking is a useful feature that works in conjunction with your formulas. If you know what a formula result should be, Excel can tell you which values of one or more input cells you need to produce that result.
Calculating the difference between two time stamps
Because timestamps are represented as serial numbers, you can subtract the earlier time from the later time
to get the difference.
Calculating the number of work days between two dates
When calculating the difference between two dates, you may want to exclude weekends and holidays.
Increase the number of Undo levels in Excel
By default, the number of Undo levels in Excel for Microsoft 365 is 100. You can increase or decrease this number if it's necessary.