Meaning

• The means by which something is accomplished.

  "I am not interested in the why, but in the how."

Meaning

• To what degree.

  "How often do you practice?"

• In what manner.

  "How do you solve this puzzle?"

• In what state.

  "How are you?"

• Used as a modifier to indicate surprise, delight, or other strong feelings in an exclamation.

  "How very interesting!"

Meaning

• The manner or way that.

  "I remember how I solved this puzzle."

• That, the fact that, the way that.