I think the best way or time to use TA is after you have found a stock or ETF that you think is a buy based on fundamentals. After that look for favorable seasonal patterns and then look to simple TA to find a good entry point.
A good website to go to is Don Vialoux site he is very good at using seasonal and then TA to enter a positionhttp://www.equityclock.com/seasonality/http:// www.dvtechtalk.com/
TA has many components to it. I think it is best to start simple and test it on stocks usually starting with a one year chart. You then will hopefully find some components that you think you can work with that you are comfortable with. The whole idea is to try to reduce the odds of being wrong when you make a purchase.
The hardest things to learn though is taking a loss or how to handle your gains if you are going to use it for trading. You will need a strategy, rules and discipline to pull it off.
As far as relevant goes, a lot of TA can be seen differently by different people so you can have many different forms of it as you mix it together. Also if a TA didn't work well anymore 20 years ago it may work better today if people aren't using it much anymore.
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