Change colors of single words or part of sentences

Thanks a lot, this solved the problem. One last question: do you have a hint on how to treat bold and italic inside that colored text? Do I have to re-define them somehow for each color?
Let me explain: by typing: {{light-yellow "text **here**"}}, I am not obtaining the word here in bold, but it prints also the star symbols: what I get as output is “text **here**” instead of “text here”"