When you are playing a game of hangman it is often helpful to guess some vowels first to get you started.
Vowels include the letters A, E, I, O, and U.
One of the most common vowels is the letter E, so it is probably the best vowel to guess first. It is likely that U is the least common vowel, and therefore it should be guessed last.
After guessing a few vowels some good letters to guess are the "Wheel of Fortune" letters.
These letters are R, S, T, L, and N. They are widely regarded as very common letters used in words.
After guessing several of these letters you are on your own to guess the remaining letters in the word.