What on earth made you inspired about this topic? Or it might be you know nothing about bitcoin; that is why you thought buying bitcoin is not safe. Although this is a safe space, I will tell you that buying bitcoin is safe and profitable, and there is no specific time to buy bitcoin. You can buy bitcoin all the time, and if you can hold it for a long time, then you will be able to get a lot of profit. That is why in many cases people hold their bitcoin for almost 5-10 years. But before you invest, you will have to get some knowledge because you cannot invest in what you know nothing about.