
There are lots of disadvantage of technical analysis:
Interference: Technical analysis is very one-sided. Quick changes in the plan may have an unfavourable impact on the trading results. What may seem on the chart to signal to enter the market, in fact, will be only a noise, that can be tracked only on large frames.
Controversial conclusions: Technical indicators may show the signals. Different traders may understand exactly the opposite. Interestingly, both traders will find lawful confirmation of his conclusions, and even quite logical.
The time lag: Signals can be delayed; the trader may also be late indecision. By the way, regarding the lag, the Dow Theory is often criticized
Exceptions: Disadvantages of technical analysis are also obvious in the fact that the figures and claim do not work 100%. Yeah, maybe you saw the build of the figure, but the external factors will work.
If you want to learn technical and fundamental analysis you can join any institute like
NIFM,
NSE India,
ICFM,
Share market Shiksha: Their online classes are hugely flexible which will set you free from the hassles of attending the pre-assigned classes and give you the freedom to learn from wherever you are and whenever you can. They also provide technical analysis courses.
(Source: https://www.quora.com/What-are-the-disadvantages-of-technical-analysis)
