Final answer:
Regarding handlebar height, students should begin with the handlebars at a comfortable position.
Step-by-step explanation:
Regarding handlebar height, students should begin with the handlebars at a comfortable position. The height of the handlebars should be adjusted to a level that feels natural and allows the student to maintain a relaxed and upright posture while riding the bike.
It is important to note that the optimal handlebar height can vary depending on factors such as the individual's height, body proportions, and riding style.