Un-beknown to most, when you insert a new column, the Format of the cells in the Column are of the cells in the Column on the Left. So, if you get a Date when you enter a number as with the example shown, you would have inserted the column to the right of a Date Formatted Field.
This can be useful if that was your intention, but most of the time it isn’t. To override this default, use the Insert Options (little Paintbrush) to c...
These shortcuts will enter hardcoded values and will therefore not change on future days. If you dynamically need to assign the current Day and / or Time to a cell or Formula you can use the following Functions:
A hover-over of your Worksheet Scroll arrows reveals two more very useful tips!
Ctrl + Left Click on the right arrow shoots to the last sheet. (Ctrl + Left click on the the left arrow will shoot back to the First one.)
Right Clicking on either arrow gives you a Pop-up Contents Page of all your Sheets that is sooo much easier to navigate. Simply Double-click on the Sheet Name once you've found it to take you straight there!