Most people move through life carrying a quiet set of assumptions about how things “ought” to work.

We often build these assumptions from our first experiences when learning something new — keeping your hands at “two and ten” while driving or leaving the house three hours before a flight so you don’t miss your plane.

These habits become little safety mechanisms we build into our routines. Over time, they turn into rules we follow without ever asking whether they still make sense.

This same pattern shows up when people enter the world of investing and trading.

Most traders stick to the tools and rules they learn first. Because most people start with stocks, they naturally inherit stock-trader rules.