When you are ready to start learning the violin, make sure that you cheer up against all odds. Learn to persevere, and to practice the right way, with a violin up to standard to learn the violin.
Posture: Adult beginners can't hold it together long enough to take a break every fifteen minutes or so, let alone kids who are not self-motivated and need to adjust and correct their posture over and over again. Good posture provides an ergonomic foundation for the rest of the technique.
Bow movement: The most critical aspect of bow movement is the alignment of muscle tension with joint laxity, and it takes years or more for a beginner to realize this. A bow that doesn't go straight, has a false articulation, doesn't change bows smoothly, and can't draw fast, clear short notes, etc., are all caused by too much slack or too much tension in the right arm.
The right hand: the position of each finger, the shift of power, control, etc., the rotation of the wrist, the bending of the arm, are all very important. It is common to see people who have been learning to play for years, even in the semi-professional arena, and who hold the bow in odd ways.
Left hand: The problem is that you can't just say the word "intonation" because it's not just about musicality, it's also about the posture of the left hand. Intonation on the violin is half by ear and half by memorizing finger spacing.