What’s the best way/app to learn a language

Specially Japanese

Why did thales choose water as the "primeval stuff", what us this "primeval stuff"

After the fall of saigon, americans a) were eager to explore the lessons of vietnam b) just wanted to forget about the war c)bought airline tickets to hanoi d)demanded that the u. s. get involved in "another vietnam"

Какие народы относятся к числу коренных обитателей кубанских земель? носителями каких языков они являются?