Fibonacci retracements are one of those tools that people either love or dismiss completely. Some traders swear by them, others think they’re just lines that happen to look good on a chart. The honest answer sits in the middle. They work not because of any magic in the numbers, but because enough traders watch the same levels that price often reacts around them.

The idea comes from a number sequence where each number is the sum of the two before it. From that sequence, a few key ratios come up repeatedly, and the ones traders use most are 23.6 percent, 38.2 percent, 50 percent, 61.8 percent, and 78.6 percent. Technically the 50 percent level isn’t a true Fibonacci ratio, but traders include it anyway because stocks often retrace about half of a move.

Here is how the tool works in practice. After a stock makes a strong move up, you identify the swing low where the move started and the swing high where it peaked. You then draw the retracement tool from the low to the high, and the platform plots horizontal lines at each ratio. Those lines show where a pullback might find support before the uptrend resumes. For a downtrend, you do the opposite, drawing from the high to the low to see where a bounce might stall.

Each level tells a slightly different story. A shallow pullback to the 38.2 percent level suggests strong momentum, since buyers stepped in quickly and didn’t let the stock fall far. A pullback to 50 percent is a more typical, healthy retracement. The 61.8 percent level, often called the golden ratio, is considered the last major area of support in a healthy trend. If price falls well below it, the odds that the original move fails start to rise, and a drop past 78.6 percent usually means the trend is in real trouble.

The best way to use Fibonacci levels is as a zone of interest, not an exact entry. A common area traders watch is between 50 and 61.8 percent, sometimes called the golden pocket. When that zone lines up with something else, such as the 21 EMA, a prior support level, or a fair value gap, the setup becomes much more convincing. This overlap is called confluence, and it’s the main reason Fibonacci tools are worth using at all. A retracement level sitting alone in empty space isn’t worth much. The same level sitting right on top of old support is worth paying attention to.

Once price reaches a level you’re watching, don’t just buy blindly. Wait for the stock to show you something, like a bullish candle pattern, a drop in selling volume, or a momentum indicator turning back up. Then place your stop just below the next Fibonacci level or below the swing low, depending on how much room the trade needs. Your target can be the previous high, or an extension level if you expect the trend to push beyond it.

Speaking of extensions, those use the same ratios to project where price might go after the pullback ends. The 127.2 percent and 161.8 percent extensions are popular profit targets, giving you a structured way to plan exits instead of guessing. Combining retracements for entries and extensions for targets gives you a full trade plan built from a single tool.

There are real limitations to be aware of. The biggest is that the tool is subjective. Two traders can draw it from slightly different swing points and end up with different levels. If you have to force the swing points to make the levels line up with something, the setup probably isn’t strong. Stick to obvious, clean swings that most people would pick, and avoid tiny moves where the levels would be packed too closely together to be useful.

Fibonacci levels also work best in clearly trending markets. In choppy, sideways conditions, price slices through the levels without caring, and you’ll end up taking trade after trade that goes nowhere. Treat the tool as one more piece of evidence, never as a standalone signal.

A good habit is to practice on past charts. Pick stocks you know, find strong trends, draw the retracements after the fact, and see how price behaved at each level. Over time you’ll notice which levels tend to matter for the kinds of stocks you trade, and you’ll build a feel for when the tool is helpful and when it’s just noise.