Thank god for loan words :D . It is a nice relief on the Indo-European-Muttersprache brain. Much easier to remember words with common roots than learning completely new paradigms in an unrelated language family. Nonetheless, that's the fun part.
Just saying, mizinamo, I rely on you as a MOD in the German course, and I consider you an honorary MOD in the Turkish course. Thanks for all your clear and helpful answers :-)
But what's the difference between them? I mean, when you use each of these words in turkish?
Because in Turkish words, 'the' is understood without writing it, we only use 'bir' as 'a/an' to mention that we do not know that thing.
"Career", as a word by itself, requires no article. "The career" is incorrect.