Say I want to combine two different colors into one, how would I do that? Like this http://www.techrepublic.com/blog/microsoft-office/highlight-text-with-the-gradient-fill-effect-in-word/
Open a new document in Photoshop.
Write the text on the document open.
Double click on the text layer and a dialogue box will open.
You will find a gradient option. Select it .
You can then select any gradient available or play around with colors to create your own gradient.