I can answer simply and I can write a pretty detailed description.

But first, I will write simply - Trading Central.
For those traders who know what it is, there is no need to explain it for a long time.

And for those who do not know, I recommend you to start using these resources. They can significantly improve the quality of your trading.

By using these analytical services you can make the number of correct trading decisions much higher. And you can also make your trading more thoughtful. But of course do your own research.