I spend hours on this forum, and for some reason I realise that this is not the way to seek knowledge.
You're absolutely right, but this place was not made to increase knowledge much. You will get to learn a few things here certainly, but no way you will actually GAIN serious Islamic knowledge. To do that you need to read secondary Islamic books and sit for lectures with scholars in your area or through an education online portal. It's also good to measure how much you know now and what books and curriculum you need to study to get where you want to be.
The obligatory amount of knowledge though is like Rashed said, is concerned with your individual obligations (Fard Ain). These are learning basics of reciting Quran, along with enough Arabic to do so, and learn all the requirements of your required worship and the five pillars of Islam, we're talking ablution, prayer, basic supplications, fasting rules and allowances, zakat payment, haj steps, major (kabaer) and minor sins, halal and haram basis, and basics of Aqeedah (faith, creed) and Tawheed (belief in the one God, that his Shariah trumps all laws, etc.).
Non-obligatory are specialized or advanced knowledge such as fiqh, principals of fiqh, science of hadith and narration etc., or community obligation (fard Kefaya) such as funerals, Takfeen, Roqya, etc., or unislamic knowledge such as worldly knowledge of science and math or professional skills such as medicine or farming.
May God lead you to the path of enlightenment