So I own $1000 in bitcoin but I want to invest the remaining amount to accumulate a whole bitcoin. The prices fluctuates every second so how can I do this on coinbase? I believe this is called a market buy order and I've looked at the steps on how to do this but I think they're outdated or wrong.
dont worry. You can buy it anytime you want and its price will fluctuate not too much, it only difference a few dollars. and as soon as you create a deal with the other server, they will close the price right after the click. so you're free to trade or if you're afraid the price is too high then you can choose to trade with people who want to sell bitcoins. they will sell cheaper than Coinbase or other credit cards.