السلام عليكم ورحمة الله
ممكن اعرف الفرق بين (work in) (work at) ومتى تستخدمان؟

work at sth phrasal verb

to try hard to achieve something

You need to work at improving your writing.



work on sth phrasal verb

to spend time repairing or improving something
His dancing technique is good, but he needs to work on his fitness

والله اعلى واعلم