Why do veteran traders focus on transaction fees while newcomers completely ignore them?

One of the most common mistakes newcomers make is to put all their attention on "market predictions."

However, the traders who have truly survived in the long term actually care most about three things:

👉 Position size

👉 Stop loss

👉 Transaction cost

Because in long-term games,

you cannot control the market,

you can only partially control your emotions,

but transaction fees are the only variable that can be 100% optimized.

Ignoring them is like actively giving away your advantage.