¿Cuál es la diferencia entre "So" y "Because"?

¿Cuál es la diferencia entre "So" y "Because"?

USAR "Because" PARA EXPRESAR UNA RAZÓN:

He is the best student because he studies a lot.

           (resultado) <———- (motivo)

• I didn’t go to class because I was sick.
• We arrived early today because we have a meeting at 7:00 AM.
• She got presents because it was her birthday.

USE "SO" PARA EXPRESAR UN RESULTADO:

He studies a lot, so he is the best student.

           (motivo) ——–> (resultado)

• Jane didn’t like the movie, so she turned off the TV.
• Yesterday was a holiday, so the school was closed.
• I lost my car keys, so I took a taxi.