Seeking knowledge is an obligation
طَلَبُ الْعِلْمِ فَرِيضَةٌ عَلَى كُلِّ مُسْلِمٍ
Talabu-l-'ilmi faridatun 'ala kulli muslim.
"Seeking knowledge is an obligation upon every Muslim."
Narrated by Anas ibn Malik. Sunan Ibn Majah 224 (sahih)
A short reflection
Not a bonus, not optional. The basics of what you worship, why, and how, every Muslim must know.