Dua is a plea, a direct appeal to Almighty Allah, unlike namaz, is pronounced in free form in any language.

Primary Duas:
Dua after azan
Dua, facilitating difficulties
Dua for success
Dua at the entrance / exit from the house
Dua at the entrance / exit from the toilet
Dua before / after sleep
Dua before / after meal
Dua post
Dua for parents
Dua from sadness and anxiety
Dua Exam Preparation
Dua for the one who did you good
Dua to protect
Dua for insomnia
Dua for who you insulted
Dua with strong wind
 Dua in the rain