As Salaam o Alaykum wa Rahmatullahi Wa Barkatuh!

Sayyiduna Abu Umamah (May Allah be pleased with him) reported:
The Messenger of Allah (sallAllaahu alaihi wasallam)
made many supplications which we did not memorize.
We said to him:
"O Messenger of Allah! (sallAllaahu alaihi wasallam)
You have made many supplications
of which we do not remember anything.''

The Messenger of Allah (sallAllaahu alaihi wasallam) said,

"Should I not show you such a comprehensive dua
that includes all duas?

Allahumma innin asaluka min khairi ma sa alaka minhu

nabiyyuka Muhammadun sallAllahu alaihi wasallam,

wa aoozubika min sharri mastaza minhu nabiyyuka

Muhammadun sallallahualaihi wasallam

wa antal musta an wa alaikul balagh

walahawla walaquwwata illa billah.

(O Allah, I beg to You the good which Your Prophet
Muhammad (sallAllaahu alaihi wasallam) begged of You;
and I seek refuge in You from the evil where from Your Prophet
Muhammad (sallAllaahu alaihi wasallam) sought refuge.
You are the One from Whom help is sought and
Your is the responsibility to communicate (the truth).
There is no power or strength except with Allah
the Exalted, the Great.'''


For those who do not remember many prayers, or cannot remember them,
this is the best supplication to make. This shows part of Allah's Mercy upon
his slaves and part of the easiness of practising Islam.