Not really necessary but important because we must know how to start trading. at least we know what indicators to use
Before studying indicators for trading analysis. The first step that must be done is to know the basic knowledge of trading, the terms so that it is easy to continue on the use of indicators. If support and resistance alone do not know, it is necessary to study again.
There are many tutorial videos on YouTube and can help in the process of learning technical analysis. It all depends on the willingness to learn. There's nothing wrong with taking a course, but it all depends on your intention.