Hello,
I know that trading requires knowledge, but any tricks for newbies about when to buy or sell?
Sorry, there's really no shortcut to it. I know there are users who are going to tell you to buy low and sell high. That's a generic suggestion anyone can make. Regrettably, none can pinpoint where that low or high is. Those who even give that type of suggestion are likely to be among those who are often caught unawares and they end up selling low or buying high which is against what they preach. To the best of my perspicacity, I don't believe there are actually overbought or oversold situations. At least, not while the market is still active. We only get to find out such a situation on hindsight and not while price is active around that region.