How will I know which numbers to put to get the colors I want?

Answer 1

Just remember that hexadecimal and RGB all have the same order of colours, red green and blue, And the higher value that you give them the more of that colour will be displayed.

For example, if you wanted to make pink, you could start by adding quite a bit of red to your hexadecimal - #d00. Next, you can try messing around with the other options to try to get the colour that you like.

The second option is just to look up the colour on Google and it should help you find the colour you're looking for. Here's a good website for picking out some colours - https://www.w3schools.com/colors/colors_picker.asp

Answer 2

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