Dic/ how, as a simple conjunction for evoking a special fact

▷ You use how after certain adjectives and verbs to introduce a statement or fact, often something that you remember or expect other people to know about.

• It's amazing how people collect so much stuff over the years.
• It's important to become acutely aware of how your eating ties in with your stress level.

▷ Used after certain adjectives or verbs to refer to an event or situation

• It's amazing how they've managed to get everything finished so quickly.
• I remember how she always used to have fresh flowers in the house.

▷ Used for introducing a fact used for referring to a particular fact that you want to mention

• I remember how they used to have those huge roaring fires in the winter.
• Isn't strange how no one ever mentions his name nowadays?

▷ that

• She told us how she had to work hard.
•  He knows how you are a valued employee.
• It's amazing how they completed the bridge so quickly.

... COBUILD, LDOCE, Macmillan, Merriam-Webster