I'll Meet You at/in/on Friday

Which preposition is correct? 'On' is correct. The use of 'in', 'at', or 'on' can be confusing. These guides to prepositions will help you learn correct preposition choice and test your knowledge:

In / At / On - prepositions of place explained
In / At / On Quiz 1

In / At / On - prepositions of time and date explained
In / At / On Quiz 2

In / At / On / Nothing - prepositions of movement explained
In / At / On Quiz 3