Is it really necessary to take a course before getting into trading?
You don't need a trading course. You can learn it yourself by learning it from various sources. There are already many sources that provide information about trading, especially
basic information about trading. Just learn it seriously from those sites, everyone can get enough knowledge about trading.
It is easy to learn the basics out from the internet but this couldn't be enough to make a good trade. It is better to have a mentor that would teach and guide us but refrain from joining signal group, a friend of yours, might be your relatives or someone you know already. Might not be necessary but to learn trading alone is really hard, honestly.
For a lot of sources online, it sometimes made you confused on what strategy to follow or not. But I suggest having an actual trading experience as this could give huge learning which is far different from what we have read and watch online.