A fill is where a demo either tells the truth or lies to you. These articles cover what happens to an order at the exchange and how to practise with fills that behave the same way.
Fills
How orders actually fill: queue position, slippage, partial fills, and what broker demos get wrong.
Articles
- Why paper trading fills on touch cost you money
A limit order in a broker demo fills when price touches your level. At the exchange it waits in a queue. That one difference turns a profitable demo into a losing real account.