Udacity has really helpful mentor facilities and provides really practical walkthrough sessions for complicated assignments. Also, another thing I liked is that their video lessons always develop an intuition first and then go into mathematical or technical details which is really amazing.

practical approach and "real life" cases for exercises

Reseñas detalladas con mucha información sobre cómo mejorar si es necesario. Las instrucciones son muy claras, y los videos tienen excelentes instructores narrando. Muy fácil de seguir y aprender.