When visiting Sweden and Denmark, it's helpful to learn some basic Swedish and Danish phrases. Many locals speak excellent English, but making an effort to communicate in their language is always appreciated. Some common Swedish phrases include 'Hej' for hello, 'Tack' for thank you, and 'Ursäkta' for excuse me. In Denmark, 'Hej' is also used for hello, 'Tak' means thank you, and 'Undskyld' is excuse me. Websites like Duolingo offer free language learning courses that can help you get started with the basics.