How Do I Find The Numbers That Represent A Color?

If I want to set a backround color in table properties I have to enter a number, right?

How does one know what number represents a particular color?

various sites around Jummy that list "hexidecimal colour codes"

try this one

https://www.w3schools.com/colors/colors_picker.asp

That's great. Thanks.

I have been wondering how others know what numbers to use.

That's great. Thanks.

I have been wondering how others know what numbers to use.

It also can be checked in Photoshop