vs
QUICK ANSWER
"That" is a conjunction which is often translated as "que", and "of" is a preposition which is often translated as "de". Learn more about the difference between "that" and "of" below.
that(
thaht
)A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
A pronoun is a word that stands in for a noun (e.g., she).
An adjective is a word that describes a noun (e.g., the big dog).
of(
uhv
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).