The difference between "in" and "on" is that "in" is used to indicate a position within a larger area or container, while "on" is used to indicate a position on the surface of something. For example, if you were talking about a book, you would say that it is "in" a bookcase, but "on" a shelf.
In general, "in" is used to indicate a position within a larger area or container, such as a room, a house, or a box. It can also be used to indicate a position within a particular activity, such as "in school" or "in church."
On the other hand, "on" is used to indicate a position on the surface of something, such as a table, a wall, or a floor. It can also be used to indicate a position within a particular activity, such as "on vacation" or "on the phone."
In addition, "in" and "on" can also be used in a figurative sense to indicate an emotional or mental state. For example, you might say that you are "in love," or "on fire," to indicate that you are feeling particularly passionate about something.
In conclusion, the difference between "in" and "on" is that "in" is used to indicate a position within a larger area or container, while "on" is used to indicate a position on the surface of something.