some stuff I didn't know some time ago but is kinda useful

e.g. : we use this as "for example" among sentences but I never knew the origins of this term. It means "exempli gratia", in latin, and is actually translated to "for example"

et cetera (etc.): another latin word. Translating literally, "et" means "and" and "cetera" means "other similar things" or simply "the rest". As it has an "and" with it (et) there isn't actual need to write ", etc." or "and etc.", and you don't have necessarily to begin the next word with a capital letter

weeb stuff

oni/onii: older brother, although "oni" means demon or ogre too
ane: brother
ototo: younger brother
onee: older sister
imouto: younger sister
ani: sister

ane and ani have some variations. The most common and the only I know is aneki and aniki which is informal