Learning the knowledge of Deen
The prophet (sallahu alaih wasallam) said:
طَلَبُ العلمِ فَرِيضَةٌ على كُلِّ مُسلمِ
“seeking knowledge is mandatory upon every individual Muslims”. As following this prophetic command, we all must make all the effort to seek knowledge of deen to correct our beliefs, prayers, and daily etiquette.