As-Salaam alaykum,

We often tend to forget the importance of the simple yet powerful du'a/supplication of saying or reciting 'Astaghfirullah' ( I seek forgiveness of Allah ).

Some of its virtues and benefits include:--

1) Istighfar removes anxiety and makes one's du'a to be answered.

2) It opens the door of sustenance, Mercy and Knowledge.

3) Reciting Astaghfirullah helps us to calm ourselves and wipes out variety of worldly worries from our mind and body.

Ibn Abbas, may Allah be pleased with him, said:-- The Messenger of Allah, Sallallahu alaihi Wasallam, said:-

"If anyone constantly seeks pardon (from Allah), Allah will appoint for him a way out
of every distress and a relief from every anxiety, and will provide sustenance for him
from where he expects not." [Abu Dawud].

Given this Noble Hadith, we should include recital of lots of Istighfar (at least 100 times) in our daily Zikr when we come to Remember Allah.. every morning and every evening.