Prepared by A-J | Author brand: 盡職生活｜阿J的普通人理財筆記
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-16 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-16 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
Beginner principle: Understand the mechanics and risks before buying. Knowing orders, settlement, and costs matters more than finding a hot tip.
A limit order specifies your price
A limit order can execute only at your limit or a better price, making it useful when price control matters.
A market order does not guarantee a fixed price
A market order prioritizes execution rather than a particular price, so fast markets and wide spreads require caution.
ROD, IOC, and FOK define order duration
ROD remains valid for the day; IOC executes immediately where possible and cancels the rest; FOK requires full immediate execution or cancels the entire order.
Not every order type is accepted at the open and close
The opening and closing auction periods generally accept limit ROD orders rather than market, IOC, or FOK orders.
What to learn next
- No account yet: start with the account-opening guide
- Planning to buy ETFs: learn fund structure and premiums/discounts
- Considering leverage: first understand margin and stock-backed borrowing risks
Primary / official sources
General investing education only. Market rules and fees can change; use current exchange, regulator, and broker disclosures.