Islam is the message from Allah; The Creator of the universe to all human beings which tells them the main facts of the existence:

1. Faith in The Only Creator; Allah. (Tawheed).

2. Faith that Allah is The Absolute Just.(Adl)

3. Faith in all His Prophets from Adam to Muhammad (SAWA).(Nobowwah).

4. Faith in the Divine leadership after the Prophet who lead people to the real teachings of Islam.(Imamah).

5, Faith in The Day of Judgement. (Qiyamah).

Practical foundations in Islam are based on Justice and fairness and doing good to every one and avoiding harmful acts e.g, injustice, lying, alcohol, gambling, immorally etc.

Islam teaches remembering Allah before and with every act, and by that avoiding sinful acts.
Daily Prayers are compulsory at dawn (Fajr),  Dhohr (Noon), Assr (after noon), Maghrib (evening) and Isha (night). Compulsory Daily Prayers keep the believer remembering and talking to The Creator and purify the believer from evil acts and bad thoughts.

There are also practical obligatory acts beside Daily Prayers e.g. Fasting the whole month of Ramadan on those who are not ill and not traveling, Giving Khums and Zakat on those who have more than their lawful expenses, performing Hajj for those who are able, Jihad against evil, Joining and supporting good and preventing and opposing bad, and following the divine servants of Allah and disassociating from the enemies of Allah. 
Islam teaches healthy relationship between man and himself, and between man and his family and people, and between man and His Creator Allah.

Wassalam.