God has given a "free will" to all Humans. HE has sent guidance & laws through Prophet (s).
We are required to recognise them and be obedient to them, out of free choice.
We can then fulfill the purpose of life, worship, and elevate our soul, to obtain salvation and eternal Rewards.
Fiqh/Laws/Shariah/ regulate ALL aspects of Life in Islam- Topic Index
Law n Fiqh books
like
Eating, Marriage ,
Transacting & in
Death
It details the methods of
Daily Prayers,
Fasting ,
Khums ,
Conditions for Enjoining Good(Amr bil Maroof) etc.