Market, limit and stop orders

The lesson in full

Tapping Buy isn't the only way in. Orders let you choose: now at any price, only at your price, or only once price reaches a level.
A market order says "fill me now". It's fast, but you take whatever price is on offer, plus the spread.
A limit order says "only at my price or better". EUR/USD is at 1.1250 and you want it cheaper? A buy limit at 1.1200 waits 50 pips below.
A stop order says "go once price gets here". Buy stops sit above the price, for example to catch a breakout. Sell stops sit below it.
Your exits are orders too. On a long trade, a stop loss is a sell stop below the price, and a take profit is a sell limit above it.
Common mistake
Myth: a stop loss always fills at your exact price. A triggered stop becomes a market order. If EUR/USD gaps from 1.1210 to 1.1150, a stop at 1.1200 fills near 1.1150: that's slippage.
Key takeaway
Market = now. Limit = my price or better. Stop = once price gets here. Pick the order before you tap.

EUR/USD is 1.1250. You want to buy only if it dips to 1.1200. Use a... Buy limitA buy limit waits below the current price and only fills at your price or better.
You want to buy only if price breaks above resistance. Use a... Buy stopA buy stop sits above the current price and triggers once price climbs to it, as in a breakout.
A stop loss on a long trade is a... Sell stop below the priceTo exit a long you sell. A stop loss triggers if price falls, so it's a sell stop placed below.
You're long. Your take profit order is a... Sell limit above the priceTaking profit on a long means selling higher, at your price or better. That's a sell limit above.