Preposition use

Does the use of different prepositions create a difference in meaning between the two sentences below? Are any of the prepositions being used incorrectly?

"I am especially interested in pursuing learning prospects that will allow me to expand my knowledge about different subject areas."

"I am especially interested in pursuing learning prospects that will allow me to expand my knowledge of different subject areas."

"I am especially interested in pursuing learning prospects that will allow me to expand my knowledge in different subject areas."

Thanks in advance.