Learn Hardcore Korean: munseo jageop jungeneun jaju jeojanghae dwoya anjeonhae. - It’s safer to save often while working on documents.

문서 작업 literally means “document work” (e.g., editing or creating documents). The ending -중에는 comes from 중 (“during/in the middle of”) plus the topic marker 는, so 문서 작업 중에는 means “while working on documents” or “when you’re in the middle of document work.”

Why is there a 는 after 중?

The 는 is the topic marker. Added to 중 (“during”), it emphasizes that we’re talking specifically about the time period “during document work.” Without 는, it would still be understandable but less focused on that time frame as a topic.

What does 자주 mean?

자주 means “often” or “frequently.” It indicates you should do the action repeatedly, not just once.

What is the function of 저장해 둬야 in this sentence?

저장해 둬야 comes from the verb phrase 저장해 두다 (“to save and keep it saved”) combined with -아/어야, which expresses necessity or obligation (“must”). So 저장해 둬야 means “you must save (it frequently/and keep it saved).”

Why is it 둬야 instead of 두어야?

둬야 is the colloquial contraction of 두어야. In spoken and informal written Korean, 두어야 often becomes 둬야 for ease of pronunciation.

What does 안전해 mean here, and why not 안전하다?

안전해 is the informal present tense of 안전하다 (“to be safe”). In casual speech, verbs/adjectives drop -다 and add endings like -해 to state facts or describe conditions. So 안전해 means “(it’s) safe.”

What level of politeness is used in this sentence?

This sentence uses the informal casual style (반말) because of endings like 둬야 and 안전해. It’s appropriate among friends, family, or as a personal note, but not in formal or polite contexts.