What sort of information you are talking about?
As for Ahadeeith, although there are weak ones too, a thorough investigation of the transmitters and the text, etc. has been made, and there is classification of these Ahadeeth.
I will give at the end the names of the Sihah Sitta: the collection of six books that are commonly consulted. All AHadeeth in the first two: Bukhari and Muslim are considered Sahih. The others have weak ones as well, but work has been done to identify and label them as well. The most recent work has been that of the late Shaykh Nasiruddin Albani, who has sorted out and re-published the collections of Ahadeeth that initially contained the weak ones as well as the Sahih ones. There are other smaller collections: like Sahih ibne Habban that also have Sahih Ahadeeth. The muwatta of Imam Malik is also considered Sahih by some. The scholars know of weaknesses in Ahadeeth, and have classified them.
So what it boils down to is what level of knowledge you seek when you are referring to Ahadeeth.
The compilers of Sihah Sitta:
1st. Bukhari (810-870 A.D. 256 A.H.) made a collection of about 7,275 hadiths (3,000 to 4,000 independent sayings) (out of around 300,000 he knew of) that is almost universally recognized as "next only to the Qur’an in authority".
2nd. The Sahih Muslim, by Imam Muslim (817-875 A.D. 261 A.H.) is the second most authoritative collection, with 7,190 hadiths (4,000 independent sayings).
3rd. Sunana-e-Ibn Maja/Majah (824-886/887 A.D. 273 A.H.) is a collection of 4,341 Hadiths
4th. Sunan-Abu Da’ud/: Dawud/Dawood al Sidjistani (817-888/9 A.D. 275 A.H.) submitted his collection to Ahmad bin Hanbal, who approved it. He collected 4,800 hadiths out of 500,000. His had the principle that "transmitters are considered trustworthy provided there is no formal proof to discredit them."
5th. Jami-Tirmidhi: Abu’ ‘Isa Mohammed ibn ‘Isa bin Sawra ut-Tirmidhi (pronounced TER-mid-hee) (825-892 A.D. 209-279 A.H.). It has about 3,956 hadiths.
6th. Sunan Nasa’i (or Al Nasa) (830-915 A.D. 215-303 A.H.) later than the others, is a collection of 5,764 hadiths.
These six collections together are called Sihah Sitta. Beyond these early six collections are others. Some Muslims believe a seventh hadith collection is also authoritative: the
Muwatta’ Malik. Other Sunni sollections of AHadeeths are: Sunan al-Darimi, Musnad of al-Humaydi, Sunan al-Daraqutni and the Musnad Ahmad ibn Hanbal