For children, - Anger management tips and techniques according to Islamic teachings

Noble Qur'an says, "And if an evil suggestion comes to you from
Shaitan (Satan), then seek refuge in Allah, He is hearing and
knowing." (7:200) and Holy Prophet Muhammad (saw) said: "If a man gets
angry and says, 'I seek refuge with Allah,' his anger will go away."
Therefore when someone is angry he should immediately say "A'udhu
billahi minash shaitanir rajim." Meaning, I seek shelter in Allah
(SWT) from the rejected Satan.
Imam Muhammad al-Baqir (as)said: "Verily, anger is a spark ignited by
the Shaitan (Satan) in the human heart. Indeed, when anyone of you
gets angry, his eyes become red, the veins of his neck become swollen
and Shaitan (Satan) enters them. Therefore, whosoever among you is
concerned about himself on account of it, he should lie down for a
while so that the filth of Shaitan (Satan) may be removed from him at
the time."
Holy Prophet Muhammad (saw) has said, "Anger is from Shaitan, Shaitan
is from fire; fire is put out by water; so when one is angry he should
do Wudu (Ablution)."
Holy Prophet Muhammad (saw) has said, when one of you becomes angry
while standing, he should sit down. If the anger leaves him, well and
good; otherwise he should lie down.
Be silent, don't speak. Holy Prophet Muhammad (saw) has said, "If any
of you becomes angry, let him keep silent."
Divert attention away from the cause of anger and participate in
strenuous physical activity aiming at letting steam out and relaxing
muscles.
Try to pinpoint the exact reasons why you feel angry. Once you
identified the problem, consider coming up with different strategies
on how to remedy the situation.
Forgive and forget. Remember the rewards and virtues of patience,
mercy and forgiveness. Those who spend (freely), whether in
prosperity, or in adversity; who restrain anger, and pardon (all) men;
Allah loves those who do good. ( Noble Qur'an, 3:134)