As Salaam Alaikum wa Rah!matuAllaah wa Barakatu.
Many of our Muslim youth ignore the rulings of Hairstyles and Haircuts out of arrogance or ignorance. Here are some Hadeeth regarding the permissability and impermissability of Haircuts (taken from salafitalk.net):
Cutting the hair off is Permissable
Ibn 'Umar narrated that the Prophet, upon whom be peace, said, "Shave it all or leave it all." (Related by Ahmad, Muslim, Abu Dawud and an-Nasa'i).
Qiza (Shaving one part and leaving the other is not permissable, example crew cuts)
Nafa' related from Ibn 'Umar that the Messenger of Allah prohibited qiza'. Nafa' asked, "What is qiza' ?" He said, "It is to shave off part of the hair of a youth and to leave part." (AlBukhari and Muslim.) Volume 1, Page 23
Volume 7, Book 72, Number 803:
Narrated Ubaidullah bin Hafs: that 'Umar bin Nafi' told him that Nafi', Maula 'Abdullah had heard 'Umar saying, "I heard Allah's Apostle forbidding Al-Qaza'." 'Ubaidullah added: I said, "What is Al-Qaza'?" 'Ubaidullah pointed (towards his head) to show us and added, "Nafi' said, 'It is when a boy has his head shaved leaving a tuft of hair here and a tuft of hair there." Ubaidullah pointed towards his forehead and the sides of his head. 'Ubaidullah was asked, "Does this apply to both girls and boys?" He said, "I don't know, but Nafi' said, 'The boy.'" 'Ubaidullah added, "I asked Nafi' again, and he said, 'As for leaving hair on the temples and the back part of the boy's head, there is no harm, but Al-Qaza' is to leave a tuft of hair on his forehead unshaved while there is no hair on the rest of his head, and also to leave hair on either side of his head.'"
Volume 7, Book 72, Number 804:
Narrated (Abdullah) bin 'Umar : Allah's Apostle forbade Al-Qaza' (leaving a tuft of hair here and there after shaving one's head.)
Book 24, Number 5289:
Ibn Umar reported that Allah's Messenger (may peace be upon him) forbade Qaza. I said to Nafi: What is Qaza'? He said: This means having a part of a boy's head shaved and leaving a part unshaven.
Book 24, Number 5290:
This hadith has been reported on the authority of 'Ubaidullah with the same chain of transmitters. and the exposition of Qaza' is the same as that of Abu Usama.
Book 24, Number 5291:
This hadith has been narrated on the authority of 'Umar b. Nafi' with the same chain of transmitters and Muhammad b. Muthanna as well as 'Umar b. Nafi have given the same exposition (of the word Qaza') in their narration.
Book 24, Number 5292:
This hadith has been narrated on the authority of Ibn 'Umar through another chain of transmitters.
Braiding is Halaal
Sahih Al bukhaari Volume 7, Book 72, Number 796:
Narrated 'Abdullah bin 'Umar : I heard 'Umar saying, "Whoever braids his hair should shave it (on finishing lhram). You'd better not do, something like Talbid." Ibn Umar used to say: "I saw Allah's Apostle with his hair stuck together with gum."
The Prophet's Hair
Neither Curly nor Straight
It was narrated that Anas ibn Maalik (radee Allaahu 'anhu) said, describing the Prophet (sallAllaahu 'alayhi wasallam), he was of average height, neither very tall nor very short. He had a ruddy complexion, neither very white nor very dark, and his hair was neither curly nor straight. The revelation came to him when he was forty years old.
- Narrated by al-Bukhaari, 3354; Muslim, 2338
To his ear lobes
It was narrated that al-Baraâ€™ ibn â€˜Aazib (radee Allaahu 'anhu) said: The Prophet (sallAllaahu 'alayhi wasallam) was of average height and broad shouldered. He had hair that came down to his earlobes. I saw him wearing a red garment and I never saw anyone more handsome than him.
- Narrated by al-Bukhaari, 3358; Muslim, 2337
To his shoulders
It was narrated that Qutaadah said: I asked Anas ibn Maalik (radee Allaahu 'anhu) about the hair of the Messenger of Allaah (sallAllaahu 'alayhi wasallam). He said, The hair of the Messenger of Allaah (sallAllaahu 'alayhi wasallam) was neither curly nor straight, and came down to a point between his ears and his shoulders.
- Narrated by al-Bukhaari, 5565; Muslim, 2337
According to another report, his hair used to touch his shoulders.
- Narrated by al-Bukhaari, 5563; Muslim, 2338
It was narrated that â€˜Uthmaan ibn â€˜Abd-Allaah ibn Moohib said: I entered upon Umm Salamah and she brought out to us one of the hairs of the Prophet (sallAllaahu 'alayhi wasallam) which was dyed.
-Narrated by al-Bukhaari, 5558.
Ahmad (25328) added: ... dyed with henna and katam.
It was narrated from â€˜Ibn â€˜Abbaas (radee Allaahu 'anhu) that the Messenger of Allaah (sallAllaahu 'alayhi wasallam) used to let his hair hang down over his forehead and the mushrikoon used to part their hair, and the People of the Book used to let their hair hang down over their foreheads. The Messenger of Allaah (sallAllaahu 'alayhi wasallam) liked to be like the People of the Book in matters where there was no specific command. Then the Messenger of Allaah (sallAllaahu 'alayhi wasallam) parted his hair.
-Narrated by al-Bukhaari, 3365; Muslim, 2336).
an-Nawawi said: The correct view is that both letting the hair hang down over the forehead and parting it are permissible, but that parting is better.
Sharh Muslim, 15/90
Hair stuck together
It was narrated that Ibn â€˜Umar (radee Allaahu 'anhu) said: I saw the Messenger of Allaah (sallAllaahu 'alayhi wasallam) raising his voice in the Talbiyah, with his hair stuck together.
-Narrated by al-Bukhaari, 5570; Muslim, 1184
It was narrated that Umm Haaniâ€™ said: The Prophet (sallAllaahu 'alayhi wasallam) came from Makkah with four braids.
Narrated by at-Tirmidhi, 1781; Abu Dawood, 4191; Ibn Maajah, 3631. Classed as saheeh by al-Haafiz Ibn Hajar in Fath al-Baari, 10/360.