Bismillahir rahmanir rahim:
Allah Ta'ala,almighty Lord, would send his prophets a.s. as the guide unto to the people. The prophets a.s. Had The access to Allah Ta'ala, the almighty Lord either direct or thru angel. They had been revealed the commandments which they had to preach to their nation. This series of prophethood came to an end at the advent of the prophethood of last messenger of Allah Ta'ala, Hz Mohammad s.a.w. He has left us the Nobel Quran n his way of life in form Ahadis which have been compiled in books.
Fundamental tenets n principles of Islam are as follows:
1: Monotheism: oneness of Almighty Lord. There's no creater n no sustainer but Allah. Allah is omnipotent. Allah is omniscient. Allah is omnipresent. Allah is all knowing. Allah is all listening. Allah is all giving. Allah is all taking. Allah is all honouring. Allah is all curing. All the powers are vested in the command of Allah Ta'ala. Allah Ta'ala is the Lord of judgement day.
This whole of the universe will come to an end on a fix day, about which only Allah Ta'ala knows the best. All of the human beings will be brought to justice. N they will be rewarded or punished as per their deeds. In this temporal life each of us has 2 angels with us, who write the good or bad deeds of ours in a book n that book will have to be opened on the judgement day n the judgement will be done accordingly.
We have to believe in the prophethood of Hz Mohammad s.a.w. We have to believe in him without any saying. He is the role modal for whole of the human beings. We have to change our lives according to his way of life to succeed in this life n the life of hereafter.
This is the symbolic meaning of our Kalima '' La ilaha il lal lahu moham Madur rasu lul lah.
(continued.........)

2.Justice:
Having faith in God's justice.so He is mighty and does not oppress anyone, and does not do anything without wisdom.
So what he creates,gives and take back,There is a reason even if we do not know.
However, it should be noted that when say, "God is mighty" means He don't oppress,Not that there is no injustice! There are many oppress in the world But this is the oppress people are bringing together Or arising from the material world. However, the revenge of the oppressed will be taken

to be counted...

I. Shahada or Iman (belief)
II. Salah or Namaj (prayer)
III. Sawm or Roja (fasting)
IV. Hajj (pilgrimmage)
V. Zakat (Alms)
- these are the five pillars of Islam.


please visit http://sunnah.com/bukhari/2/1 for the source of the five pillars of Islam.
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the five pillars to muslims are like the ten commandments to the jews or christians. the ten commandments are also present inside islam.

Narrated Abu Huraira:

One day while the Prophet was sitting in the company of some people, Gabriel came and asked,

"What is faith?"
Allah's Apostle replied, 'Faith is to believe in Allah, His angels, meeting with Him, His Apostles, and to believe in Resurrection."

Then he further asked, "What is Islam?"
Allah's Apostle replied, "To worship Allah Alone and none else, to offer prayers perfectly to pay the compulsory charity (Zakat) and to observe fasts during the month of Ramadan."

Then he further asked, "What is Ihsan (perfection)?"
Allah's Apostle replied, "To worship Allah as if you see Him, and if you cannot achieve this state of devotion then you must consider that He is looking at you."

Then he further asked, "When will the Hour be established?" Allah's Apostle replied, "The answerer has no better knowledge than the questioner. But I will inform you about its portents--

1.When a slave (lady) gives birth to her master.
2.When the shepherds of black camels start boasting and competing with others in the construction of tall buildings.
And the Hour is one of five things which nobody knows except Allah.
The Prophet then recited: "Verily, with Allah (Alone) is the knowledge of the Hour--." (31. 34)

[Sahih al-Bukhari, 1:2:48]