Anybody trade using only fibonacci or just one indicator?

In my experience, nothing works in isolation. I'm big on indicators, but the ones I use have to complement one another, so for example an important fib level like the 61.8% will be much stronger if it coincides with something else, like a daily pivot, trend line, or key moving average. Used correctly, and in unison, indicators are incredibly powerful, fibonacci included.

Yes. Either one of these which are from Davit's TDI thread - they look different but the same otherwise - will do and use Weekly but do look at Daily and Monthly. I hope it is ok to post these here - they are the only method I use. Here is a cut/paste saved from somewhere in ff -

"Key concept is being aware of turning zones
61 specially 78 zone
Google Scott Carney 786 fib you'll get interesting results. 78Fib is not even on Fib Meta tool default setting and many traders are unaware of its significance.
"0.786 Retracement
The 0.786 retracement is the square root of the 0.618. The 0.786
retracement is the next critical area to examine, after the 0.618 has been
clearly violated. The 0.786 is a vital Fibonacci number because it is often
the last chance reversal area before retesting the original price point. Price
action that does not reverse from the 0.786 usually will retest, and often
break past the original starting point. Therefore, 0.786 failures are
significant because the stop loss limit will be clearly defined by the original
starting point and relatively small in comparison to the potential reversal.
The 0.786 retracement is fairly unknown in the industry, although I
believe that more technicians are becoming aware of its significance. In my
opinion, it is a crucial Fibonacci number, since it is one of the last harmonic
ratios before retesting a trends prior high or low and it can provide a clear
indication of the future direction based upon the price action at the number.
Another reason the 0.786 is a valuable Fibonacci number is because it
can often gauge potential opportunities, especially when the surrounding
market noise (information) suggests that the set-up is to be avoided. I
have observed many situations, where the information in the media is quite
contrary to what the price action at the 0.786 is indicating. If a stock is
trending strongly, the 0.786 projection frequently can serve as a key reversal
point, despite such contrary information. The following illustrations and
examples will elucidate this concept."

Yes all indicators are 100% accurate 100% of the time, in hindsight.....

Yes, and that's the paradox to trading. It looks so easy in hindsight that a child could do it. There is an extremely important difference which though obvious, takes a long long time to get used to and to master, and that is that the result can be seen on historical charts, but on live it cannot. The indicators however are there for both, the only difference being that on live charts they stop at or just before the price, and this is what makes trading so difficult, because each trade is a jump into the unknown, and a jump that punishes us each time we are wrong.

What we have to do is learn to recognize the patterns and trust our indicators, 100%. I've used the night pilot analogy before because it is very instructive. Pilots flying at night have to rely on their instruments completely, even if to them if may feel as if they are too low, too high, or flying upside down. As long as their instruments tell them they are flying at the correct altitude and on course, then that is what they must trust. Same with trading - settle on your favourite indicators, ones you know work through previous trial and error, and when they give you the signal to jump, then that is what every trader must do, without hesitation. Easier said than done, but done it must be.

Yes, I use Fibo trading tool in my live trading chart! But, I can’t rely on only this tool, Forex market it’s a decentralized market, so I use multiple parameters to determine the good entry points! By the way, Fibo helps me to identify current market trend!