This is a beautiful dua to say after every salah. This is something that we should all learn to say after praying!

The Prophet [peace and blessings of Allah be upon him] said to Mu’aadh ibn Jabal:
“O Mu’aadh, by Allah indeed I love you, and I advise you, O Mu’aadh, do not forget at the end of every prayer to say:Allaahumma a’inni ‘ala dhikrika wa shukrika wa husni ‘ibaaditika.

O Allah, help me to remember You, give thanks to You and worship You in the best way.”

[Narrated by Ahmad, Abu Dawood]