Study; the act of learning or acquiring knowledge/skills (commonly used as 勉強する).
私は毎日日本語の勉強をしています。
I study Japanese every day.
来週の試験のために図書館で勉強した。
I studied at the library for next week's exam.
彼は大学で経済学の勉強をしている。
He is studying economics at university.
Diligence; the quality of working hard. Can refer to earnest effort toward study or work.
彼女は勉強を怠らない優秀な社員だ。
She is an excellent employee who never neglects her studies/learning.
日々の勉強の積み重ねが大切だ。
Daily steady effort is important.
Experience or lesson learned; knowledge gained from events (as in "That was a good lesson").
今回の失敗はいい勉強になったと思う。
I think this failure was a good lesson.
海外での生活は貴重な勉強になった。
Living abroad was a valuable learning experience.
In commerce, a colloquial use meaning to give a discount or make a concession on price (e.g., "I'll make it cheaper").
まとめて買うなら、少し勉強しておきますよ。
If you buy in bulk, I'll give you a small discount.
店長が勉強してくれて、値段が安くなった。
The manager gave a concession and the price was reduced.