Jack Paul 
Do you know what happens after you press the buy button? For most retail investors, the answer is vague. The order type decides whether you pay the price you saw on screen or something worse. I think this matters more than the coin choice, especially when the amount is not tiny.
Market Orders Buy Speed, Limit Orders Buy Price
A market order has no price. It buys or sells immediately at the next best available price. Execution is certain, but the final price is open. In calm markets with deep order books the difference is small. In thin pairs or right after a big news item, it can hurt.
A limit order is the opposite. You set the maximum price for a buy or the minimum for a sell. If the market never reaches your price, nothing happens. That is not a fault. That is the commitment you made.
One detail people miss is partial fills. If only part of your quantity is available at your limit, the rest stays in the book. A quick look at open orders each day prevents confusion later.
Stop-Loss and Stop-Limit Are Triggers
A stop-loss is a sleeping order. Once the price touches your stop mark, it wakes up and sends an order into the market. With a classic stop-market, that order is a market order. You get out, probably, but at an unknown price.
With a stop-limit, the trigger sends a limit order. You know the worst price you accept, but you risk not getting out at all if the price jumps past your limit. The distance between the stop mark and the limit needs to be generous. Otherwise the protection fails in the exact moment you need it.
Spread, Slippage and Fees Affect Every Order
The spread is the gap between the best buy and sell price. It is a real cost, even though it does not appear on any fee statement. Large pairs against the euro have narrow spreads. Small pairs and stablecoin detours cost more.
Slippage only hits orders without a price limit. A market order can fill worse than displayed when your amount clears several price levels. A limit order cannot have negative slippage because it simply does not execute above your price.
Fee tiers matter too. A market order is always a taker order and usually pays the higher fee. A limit order becomes a maker order when it rests in the book. Regular traders who use only market orders pay more on every single trade.
Which Order Type Should You Use?
For small monthly buys in a liquid euro pair, market order is fine. For larger amounts, use limit orders and break up the sum. For protection, choose between exit certainty and price certainty. Stop-market when the position matters. Stop-limit when you need a worst-case price.
Since late 2024, European providers must follow best execution rules under MiCA. But when you set a limit price, you give an explicit instruction and take responsibility for it. Read the execution policy if you want to know how your venue routes orders.
Order types are not complicated. They just reward those who look at the screen before pressing the button.