Hiểu rõ giai đoạn dậy thì. Thiết lập ranh giới và hậu quả rõ ràng. Nghỉ ngơi đôi chút. Tìm kiếm sự trợ giúp đối với hành vi tiêu cực.

Given the above summary, write a detailed text in English for it.
Teenagers experience huge hormonal shifts; acute stress in their interpersonal lives due to budding romances, friendship turmoil, and bullying; and a growing sense of independence. Unfortunately, they still lack emotional maturity and their brains are still developing to understand long term consequences of their behaviors. These factors make a volatile environment for many parents of teens, who struggle with their children's stubborn and rebellious attitudes on a regular basis. Puberty is a process lasting several years, not a one-off experience, and it usually starts between the ages of 10 and 14 for girls and 12 and 16 for boys.  During that time, changes in behavior are typical for both genders. Just like toddlers and children, teenagers thrive in an environment with clear expectations and boundaries for their behavior. While many teens will test the limits, they crave consistency on your part. Create and enforce family rules with clear consequences.  Let your teen give input on the rules and consequences, and put them in writing. This helps your teen to feel like you take his opinions seriously and that he has some personal investment in behaving well. For example, if your child runs up his cell-phone bill by using too much data, the consequence might be that he has to pay the bill or that he loses his cell phone for the following week. Be consistent, but be willing to make adjustments as necessary. If your set of rules and consequences is not working for the family, sit down with your teen and reconsider other options. Also, be willing to relax your rules on occasion if your child is responsible and respectful (for example, letting him stay out late for a special event). The teenage years can be especially trying to a parent's emotions. Volatile, emotional teenagers often do and say things to hurt those they love and get a reaction. But yelling at one another and letting your emotions get out of control is counterproductive to effective discipline.  Prepare responses ahead of time. If your teenager...