Astagfaar is asking Allah’s forgivness
There are many Astagfaars, one example being: as-tag-fi-rul-lah
Allah’s Messenger (Sallalahu alaihi wasallam) says, “everyday there is a new sheet for every momin, and if it does not contain astagfaar then when it is wrapped it is blackened. But if it contains astagfaar, then it is wrapped in a cover of divine light. The rays of divine light come out of it.
Allah’s Messenger (Sallalahu alaihi wasallam) says, “that person is very fortunate and obedient whose book of deeds contains loads of astagfaar”.
Allah’s Messenger (Sallalahu alaihi wasallam) says the foll are the benefits of astagfaar:
“The Almighty Allah safeguards a person from every grief and sadness who continuously recites astagfaar and provides him subsistence from very unexpected place”.
Allah’s Messenger (Sallalahu alaihi wasallam) says “Any man or woman who recites astagfaar seventy times in a day and night then the Almighty Allah pardons his/her seventy years sins.”
Make it a habit to say astagfaar and never forget that it will prove beneficial to you in this world and the Hereafter. Reciting seventy times astagfaar will not require much time but its benefits will go a long way.