An adjective modifies a noun. Tom is a quick runner.
An adverb modifies an action. Tom runs quickly.
Mom is happy when she makes dinner. Mom happily makes dinner .
Ron is a slow reader. Ron reads slowly.
That is a loud band. The band plays loudly.
Here are more examples of adjectives modifying a noun:
Mark gave a false statement to the police.
Sarah gave a true statement.
I tied a loose knot in my shoelace.
These sentences show the adverb modifying the verb:
Mark spoke falsely.
Sarah spoke truthfully.
I loosely tied the knot.