Assalaam alaikum,
Islam Question and Answer - He wants to pray the obligatory prayers only and not the naafil prayers
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Nawafil Salah
Nawafil salah are prayers said in addition to Fard (Obligatory) salah, including the Sunnah prayers of Fajr, Zuhr, 'Asr, Maghrib and 'Isha.
The Prophet saaws performed these prayers often, but not always. They are unlike the Fard salah, and are not required to be done all the time; to exceed the Prophet (saaws) in his frequency, becomes a sin of being extreme in the religion.
Abdullah ibn 'Umar reports that the Prophet sallallahu alehi wasallam said: "Make some of your prayers in your houses and do not turn your houses into graves." This statement is related by Ahmad and Abu Dawud.
Abu Dawud records from Zaid ibn Thabit on sound authority that the Messenger of Allah said: "A person's salah in his house is better than his salah in my mosque, except for the fard salah."
An-Nawawi says: "The Prophet sallallahu alehi wasallam encouraged one to offer nawafl in one's house because then the prayers are more private and will have less of a chance of being done for show and will be free from defects that vitiate good deeds. Furthermore, this will be a blessing for the house as mercy and angels will descend on it while Satan flees from it."
Do not make sunnah salat after Fajr or after Asr.
Hadith - Bukhari 7.709
The Prophet had forbidden: (A) the Mulamasa and Munabadha (bargains), (B) the offering of two prayers, one after the morning compulsory prayer till the sun rises, and the other, after the 'Asr prayer till the sun sets. (C) He also forbade that one should sit wearing one garment, nothing of which covers his private parts, (D) and prevent them from exposure to the sky; (E) he also forbade Ishtimal-as-Samma'.
Please look at the following link for the rest of the article describing Salat in detail.
Muttaqun OnLine - About Salah: According to Quran and Sunnah
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Here are some more information you might like to read.
Islam Question and Answer - Making up naafil acts of worship
Best way to offer Witr prayer.
Islam Question and Answer - Ways of offering Witr prayer that are narrated in the reports
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"these extra 12 rakaats of optional prayers, according to Imam Nasaai and Tirmithi are : 2 rakaats before the obligatory prayer of Early morning
fajr, and 4 rakaats before (
Duhr) and 2 rakaats after it ,and 2 rakaats after the obligatory of early evening prayer (
magrib) and 2 rakaats after the obligatory prayer of night (
isha) prayer."
Please follow this link to read the whole article.
Islam Question and Answer - The excellence of optional prayers
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Wa alaikum salaam