Answer:

1. Wājib (Obligatory): such as the five prayers, fasting in Ramadān, and dutifulness to one's parents.

Performing what is obligatory will be rewarded, whereas, abandoning it will be punished.

2. Mustahabb (Recommended): such as the regular Sunnah prayers, the night prayer, feeding people, and the greeting of peace. It is also called "Sunnah" and "Mandūb".

Performing what is recommended will be rewarded, and abandoning it will not be punished.

Important Note:

The Muslim must hasten to perform whatever is Sunnah or recommended and follow the example of the Prophet (may Allah's peace and blessings be upon him).

3. Muharram (Prohibited): such as the consumption of alcohol, being undutiful to one's parents, and severing kinship ties.

Abandoning what is prohibited will be rewarded, whereas, committing it will be punished.

3. Makrūh (Disliked): such as taking and giving with the left hand, and lifting up the lower part of the garment during the prayer.

Abandoning what is disliked will be rewarded, and doing it will not be punished.

5. Mubāh (Permissible): such as eating an apple and drinking tea. It is also called "Jā’iz" and "Halāl".

Abandoning what is permissible will not be rewarded, as doing it will not be punished.