I spoke to a tutor who teaches trading, and he said for his lectures, he teaches for an extended period of nine months for anyone who wants to learn trading from him.
If he said you need to learn for 9 months, it is actually his personal assumption. IMO, there is no exact time about how long we need to learn trading. We even will never stop learning trading forever because there will be always something new in trading. However, for learning about the basic things in trading, I don't think it must take 9 months. For people who can learn fast, I think he only need for 1-2 weeks only.
There are many sites we can learn how to trade without having any difficulties.
Of course, it is not difficult to get the sources of learning trading. We can learn from some threads in this forum and we can google to get the articles/videos from some sites. But make sure we learn it from trusted sites, don't take the articles from untrusted sites.