1.The most important rule is to do this when the price is low of course.
2. Another nice rule is only buy when you have to money for it, so if it goes wrong you are not going to have a lot of problems.
3. The last rule is check if the future of the bitcoin is good, look in the speculation section and talk about the future and see what people are saying.
1) Important rule? So what price is to considered as low? By following the price trend, let's say after the $500 saga last year, even at the price $470 it was considered as low price.
2) Much better buy when you afford to buy at the current rate.
3) Checking the future? LOL on this. I think you don't do trades most of the time. How come you can check the future of bitcoin is good.
No one can judge the future of bitcoin, we don't know if price would be higher or lower but if you can afford to buy with current price then you should buy some coins.