The particle で often gets lumped in with に and へ as a particle that is used to mark location. Where there is no doubt that that is what で does, I felt that it was best to keep the で particle separate to avoid confusion.
Both に and へ indicate that the subject is moving to or towards the object, but で on the other hand indicates that the subject is “at” the object.
Meet at the school.
Study Japanese at the school.
The で particle can also be seen as by means of or how you did something.
Came by car.
This is one of the easier particles to use, but it does not stop there. The で particle can be combined with certain words to create new meanings. For example what or 何 can be combined with で to make the word 何で(なにで) meaning what way or how.
By what means did you come?
I came by bus.
This might be slightly confusing seeing how there is a far more common word 何で(read なんで) used for why. The reading and usage might seem complicated at first, but it will become more natural with time.