Relax. We'll walk through this chapter like a conversation, not a textbook, so it's easy to follow.
Think about it this way for a second
Stale is like fish that's gone off — it might have been fine yesterday, but it's bad today. The syllabus got revised, the rules changed, you fixed your own mistake — but if the old version is still sitting on the table, the model will read the old one. That's why every file needs a date and a heading. If two files disagree, go with the newer one. If you're not sure, just ask.
Let's connect this to everyday life
If you have both phones-2025.md and phones-2026.md, don't include the 2025 one. Don't treat a wrong answer from earlier in the chat history as evidence. Try this — feed in one old-dated item and one new-dated item, and see which one it latches onto. If it latches onto the old one, add "only use the latest date" to your card.
Let's try it together
# phones-2026.md
Updated: 2026-06-01
Rule: စာသင်ချိန်မှာ ဖုန်းပိတ်ရမည်
Do not also pack phones-2025.mdBe able to tell old notes from new ones and include only the new.5-minute try-it
Write 2 fake files with different dates. Show which one you'd include, which one you'd drop, and how you'd note that on the card.
One quick word of caution
Old text can look perfectly stable. Stable doesn't mean correct.