right now im obsessed with the taxonomy of academia/knowledge and learning at least a very small bit of everything. theres no such thing as wasting time, if you think its fun to learn things for its own sake then thats sufficient
1. THE ARTS
performing arts
music (listen to classical, pop, rock, jazz. opera)
dance
theatre (aeschylus to shakespeare to hair/rent/wicked)
film (citizen kane and psycho through birdman and moonlight)
visual arts
art history (classical, Renaissance, modern, contemporary)
painting
sculpture
architecture (classical, neo class, gothic, international, pomo, also residential)
2. HUMANITIES
philosophy (especially epistemology which relates to mathematical logic and the foundations of mathematics, decartes, wittgenstein, russel, godel, tarski)
history (pre-history, ancient, middle ages, modern, contemporary)
religion/theology (basics of christianity, islam, hinduism, buddhism, jews, biblical exegesis is really interesting especially NT and trying to figure out who wrote what)
literature (know big names like homer, virgil, ovid, dante, goerthe, bronte, joyce, plath, DFW etc)
linguistics (grammar, language families, PIE, germanic, slavic, romance, IE isolates, finno ugric, indo aryan, iranian, turkic, sino-tibetian, tai kadai, afro semitic, bantu, nilo saharan etc. know africa and PNG have the most linguistic diversity)
language learning (english, spanish and french are world languages, mandarin, german, russian, arabic, hindi, japanese, ancient greek, latin, sanskrit also influential)
3. SOCIAL SCIENCES
anthropology (nothing really to see here)
sociology (demography based sociology is insightful, modern sociology esp theory based is left wing propaganda)
psychology (95% of psychology books (Dewey Decimal 100's) are epistemologically weak and just really bad science)
geography (know every country location, general sense of population, gdp, hdi etc besides irrelevant carrib and pac island nations)