The letter “w” is introduced after most other consonants since it’s not as common as the others. June Lyday Orton uses “wagon” as a key word to introduce it.  For example, the student can say the letter name, the key word, and the sound:  “w”, “wagon”, /w/.  As students become better at decoding, they might begin skipping or misreading the learned or red words.  For this reason, I like to often make them red again or underline them if I see that this is beginning to happen.