This book promises 21 paying websites and delivers exactly that. However, if it’s the big bucks you’re after, I guess it depends on what you consider big. It takes an awful lot of work to earn decent change from websites that pay between $2.00 and $15.00 per article. Unless you’re a very fast writer, you shouldn't expect much, and even then, I wouldn't quit your day job just yet.
Although many websites pay in a low range, some pay as much as $25.00 to $50.00, or more, per article. Naturally, such websites are more particular about the quality of your content, editing, style and spelling.
Some websites seek people to write letters or academic essays. Others provide opportunities for advertising your skills. These 21 websites will get you started along the road to profitable writing. However, reading several books on marketing for writers will help you identify more possibilities. Robert W. Bly has written several such books.