the first thing you need to do is research and if you do that you can see your question is one of the most common ones that is being asked at least once every week!

there is a lot of speculation about bitcoin and it is impossible to say which one is correct and what will actually happen. we can tell bitcoin has a lot of long term potential, and it will certainly have a good future. but the short term movements is still not clear and it makes it unpredictable.

you can wait for a drop to buy or you can stop wasting time and buy now. both strategies have its own risks associated with them. and there is always the risk of price falling.

Yeah its risky to invest in bitcoins at current price as its very expensive now and if you invest now and see major crash in price in next few days then you will likely sell your bitcoins at low price which can be unprofitable for you so better to wait for the price drop or divert your investment in altcoins.

It totally depends on what you plan to do with the coins you buy. If you're planning to sell any time soon, it might a good idea to buy but not the best or the wisest thing to do as if it starts falling down you will be totally annoyed and might even sell.

The thing is if you buy right now at the highest price bitcoin has ever been, it's a bit risky and you should be able to embrace the fact that it's more than possible for it to drop my huge amounts in extremely small amount of time. The rate of growth in its price from 7k to almost 13k now is totally crazy and has never happened not only in crypto but in anything that behaves in a similar matter (talking about stocks trading etc.).

So if you buy now, you should plan to never sell before maybe a year. And during this year you'll notice a lot of dumps and pumps and crazy stuff. But if you want to profit, you need to keep cool and let all those numbers aside and just let them where they are. No one can predict what's gonna happen. No one knows if the prices we are witnessing now are figures we won't see again ever or they'll be the base price for the future.

Why wait for the down? if you can invest right now while the value is keep rising and rising, in the end of your waiting for the down you will noticed that the value is too high and you will regret that you did a wrong decision.

First we have to know bitcoin is such good investment for everybody.
Because the price ia very high, i will recommend to wait after falling down.

Like others are suggesting I've been waiting for a correction but its not looking likely, maybe the drop to 9-9.5k recently after it first hit 11k was the correction, who knows 

I highly recommend to you bought some bitcoin now there are so many people that are waiting for correction to happen but it is really unlikely bitcoin price still increasing and i think it is wise to buy now you'll still profit a lot just be careful and always check out the market cause there really is a lot of risk in holding bitcoin with its price now.

So because the bitcoin price reached this amount, now you are willing to invest in bitcoin.  Time is so precious if you invest that amount when bitcoin price already reached $10000, you must have invested right away.  Nonetheless, you have to invest right now because we think that its price would goes up and that money of yours will increased and have a great profit.

Since I have decided to invest in my investment philosophy while it is falling or prices are not changing, I will not invest now. Of course it may result in investing at a higher stage than it is now, but I will give up that it was not lucky. I think that you should invest in your own rules.