Look up a common heart word and see which letters are often taught as the part to learn by heart.
Enter a common high-frequency word to see the part that is often taught by heart in this starter reference set.
This is a practical starter-set reference, not a universal heart-word standard. Schools and curricula sometimes mark the heart part differently.
Common heart-word teaching view
s
ai
d
Heart part: ai
The ai in said is the part to remember because it does not say the expected long a sound.

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Heart words are usually taught by showing students which part of a common high-frequency word follows a pattern they know and which part they need to remember more explicitly. The exact heart part can vary by curriculum, so the goal is not to force one universal answer for every classroom.
This tool gives a practical starter-set reference for common heart words that many early readers encounter. Use it as a teaching support, then adjust based on how your school or phonics program marks the regular and irregular parts.
See common Dolch and Fry sight-word lists grouped by grade, with the underlying word sets shown in one place.
Browse the Dolch sight word lists by level, switch between frequency and alphabetical order, and export a printable reference sheet.
Create printable sight-word flashcards from Dolch or Fry lists, then export them as a clean PDF.