'전략' means omit introductions in letters or comments.
When writing letters, we start greeting and write something about weather and inquiry.
But if you or others want the main subjects, '전략' used before main subjects.
You can used to friends, teachers and business partners - almost anyone.
My English is not good, but I want to help you, so I write some comments.
Is it useful to you?
If you have any questions, please write comments.^^