You will learn how to hold the file and the correct filing technique, but perfect correct filing can take numerous sets of nails to be an expert. Even on a 4 or 5 day course, it does not necessarily mean you will be an expert at filing.  Even techniques such as building an apex, perfect smile lines etc will take numerous sets of nails to perfect. You could spend a whole day just on the filing techniques. If you listen on your training day, you should pick up the principles of correct filing to enable you to practice to improve your skills.