Salaamun alaikum What he says it true and will apply to me, him and everyone who follows and makes Thauba and Duaa without knowing how to make Istighfaar, even more worrisome is the matter of understanding what is Thauba, and what is Isthighfaar is really!! Pls listen to the lecture by Dr.Hany Atchan ( the link is provided below) why we Should Not use ALLAAHUMMA!