Bordering in Google Sheets is not only aesthetically pleasing, but it also helps to clearly organize and separate your Cells. I will show you how to add borders to your cells as well as some of the more advanced features.
To add borders to your cells, Highlight your desired range, then click the button on the header menu that is a square made up of four smaller squares.
Upon clicking that button, you will see a small box full of custom border options.
If you want, you can select a different border color other than the basic black.
One cool thing about this is Google Sheets will recommend custom border colors to match the color scheme of your data table, If you have one.
I always like to add alternating colors to my data tables, and I find this useful when really trying to go that extra mile.
You can also edit how your border is styled. As you can see, you don't have a massive catalog, but there are a couple of cool options that you can use.
And there you have it; a basic overview of borders in Google Sheets!