Buying because you think something will be worth more in ten years, and buying because you think it will be worth more on Thursday, are two different activities with different opponents.

People use one word for two activities. Buying an asset because you expect it to be worth more years from now is one thing. Buying it because you expect to sell it higher this week is another. They share a screen and almost nothing else — different time horizons, different risks, different opponents, and different reasons for the outcome.

This section is about the second one. It explains the machinery without telling you when to press anything, because that is not something we do and because nobody honest can tell you.

Every trade has somebody on the other end

This sounds obvious and it is worth sitting with. When you buy, somebody sold to you at that price, at that moment, having thought about it. They are not necessarily wrong and neither are you — but you disagree, and one of you will turn out to have been closer to right.

So the useful question before any trade is not "will this go up". It is "what do I know, or what am I able to do, that the person on the other side is not". Sometimes there is an answer: you have a longer horizon and can sit through a fall they cannot. Often there is not, and in a market open every hour of every day, the other side is frequently software.

Investing can be positive-sum. Trading is not.

When you own a share of a business, the business can earn money, and every owner can gain at once because value is being created. That is a positive-sum arrangement.

Trading a price is different. Over a given period, one participant's gain on a price move is another's loss. Nothing is produced. Crypto complicates this slightly — a network can genuinely grow more useful over years, which is an argument for holding, not for trading — but at the level of "I bought Tuesday and sold Friday", the money came from another participant.

Add the cost of doing it and the arrangement is worse than neutral. Which brings us to the part everybody underestimates.

The house takes a cut whether you are right or wrong

Three costs apply to every position, and none depend on being correct.

1. The feeA percentage of the trade, paid on the way in and again on the way out. Small per trade, and multiplied by however many trades you make.
2. The spreadThe gap between the best buy price and the best sell price. You cross it going in and coming out, which means a position is slightly underwater the moment it opens. The order book explains where it comes from.
3. Funding, if you use derivativesOn perpetual contracts, one side pays the other at regular intervals for holding the position at all. Covered in part two of this section.

The arithmetic is unforgiving in one specific way: costs scale with activity, not with skill. Somebody trading twenty times a week pays roughly twenty times the cost of somebody trading once, and needs to be right by that much more just to stand still.

Spot and derivatives are not the same product

Almost every serious mistake in this subject starts with confusing them.

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Spot means you buy the asset and it is yours. You can withdraw it to a wallet you control. If the price falls ninety per cent, you still hold the same number of coins, and if it recovers in three years you are still there. Nobody can close your position, because there is no position — there is property.

Derivatives mean you hold an agreement about the price, backed by collateral. You never own the coin. If the price moves against you far enough, the position is closed by the platform and the collateral is gone. Whether the price recovers afterwards is no longer your concern, because you are not in the trade any more.

What can be learned, and what cannot

Some of this is genuinely learnable: how orders work, what your real costs are, how much you can lose on a position before it matters, how the plumbing behaves under stress. That knowledge is durable and it is what this section teaches.

Predicting the price of a volatile asset over days is a different claim, and the honest position is that no method has been shown to do it reliably for ordinary participants. Firms that make money consistently do so through speed, scale and structural advantage — not through a pattern you can read on a chart. Treat anybody selling that certainty as somebody whose income comes from the selling.