What To Recite After Salat (Prayers)

After performing each fard salat, you should try to recite the Ayat-ul Kursi [1]. Our Prophet said, "Between Paradise and the person who recites the Ayat-ul Kursi after fard [2] salat, there is no obstacle besides death."

After each of the five times of salat every day, you should silently say the word tanzih (Subhanallah) thirty-three times, the word tahmid (Alhamdulillah) thirty-three times, the word takbir (Allahu akbar) thirty-three times and a certain prayer (La ilaha illallahu wahdahu la sharika-lah, lahu-l-mulku wa lahu-l-hamdu yuhyi wa yumitu wa huwa 'ala kulli shay'in qadir) once; all of them add up to a hundred.

You should say "Subhanallahi wa bi hamdihi" a hundred times every day and every night. There are many blessings in it. Also, it is necessary to say once every morning and once every evening the prayer, (Allahumma ma asbaha bi min ni'matin aw bi-ahadin min khalqika, fa minka wahdaka, la sharika laka, fa laka-l-hamdu wa laka-sh-shukr by substituting (ma amsa) for (ma asbaha) in the evenings, which the Prophet has prescribed. Our Prophet declared: "He, who says this prayer during the day, would have fulfilled the thanks for that day. When he says it at night, he would have fulfilled the thanks for that night." It is not necessary to have an ablution for saying it. You should say it every day and every night.

[1] Ayat-al-kursi: one of the ayats in the Qur'an. It explains the greatness of Allahu ta'ala and the fact that His power is infinite.
[2] fard: an act or thing that is commanded by Allahu ta'ala in the Qur'an al-karim. Fard (or fard) means (any behaviour or thought or belief which is) obligatory. Islam's open commandments are called fard (pl. faraid).