You can always participate in bitcoin, but it does not meant that at any particular time that any of us is considering entering bitcoin that there is going to be any advantage in waiting and/or that an "obvious" entry point will present itself.
There is an expression that it likely pretty close to being true, and that is that the best time to enter bitcoin was yesterday, and the second best time to enter bitcoin is today.
In other words, the mere fact that the btc price has historically dipped and/or provided unexpected dip prices does not mean that it is going to happen to the degree that any of us is going to clearly and unambiguously be able to recognize such dip as an entry point.
If anyone believe that the drop in price of btc is temporary and the fundamentals of the asset are still strong you might consider buying at the lower price.
Take some time to research about this further and historical price movements. This can help you make a more informed decision about whether to buy, sell, or hold. can be taken advice from investment professionals or experienced traders about btc.You have misunderstood the person that you quoted.
A newbie, don't need to be making research about the price movement of bitcoin history before he should buy bitcoin or need to wait for the dip before he buys. This is because all those things are waste of time. A newbie should only know the basic knowledge of bitcoin, check his income and make out plan on how much that he can use to invest in bitcoin, that will not affect his other expenses, after he must have kept his emergency funds. The the left over money should be used to start investing in bitcoin weekly or monthly using DCA method, and hodli for a very long period of time. DCA method gives you the opportunity to buy bitcoin regular irrespective of the price of bitcoin, DCA is also used to buy at the dip if you don't have a reserved funds to buy at the dip. So there is no need to wait for the dip, that no one knows if it will play put or not.
The problem is that many people are trying to be too smart with Bitcoin thereby complicating what is supposed to be an easy thing. I know it is in human nature to seek for better alternatives but when that which you want to be the better alternatives turn out to be too complicated than what you are modifying, wisdom demands that you recede and take a second look, perhaps you will see the right thing to do. Anyone that go through at least two pages of this thread will already see that the target here is the buy and hold for long time and not using some complex technical analysis for immediate profit. This is why the DCA method have been supported by majority of us as it removes the need to worry about the price.
From the response of Smelody, one can easily conclude that his approach is not different from scalping strategy which is deployed in day trading of forex and other asset classes. That is really at variance with the method required for long term hold of Bitcoin
You don't need to start talking of selling at the beginning of your investment journey, because it shows that you are gambling and will run at loss, with little or no bitcoin in your portfolio, and you are not investing but trading. This is why before you start your bitcoin journey, you must consider investing in a long term, so that you can use that period to noture, grow and build your bitcoin portfolio to your bitcoin target. When you sell in your accumulation stage, you will not be able to achieve your bitcoin goal and you will lose focus on your bitcoin long term investment journey.
The provision for emergency funds will readily take care of the urge for selling. Some investors fail to setup emergency funds and that is one sure of of accumulating pressure that can lead to quick sell. I have noticed that most people who display high zeal to sell are probably over invested in Bitcoin and will easily sell at the site of profit to avoid selling at loss when they are in dare need of cash for their needs.
Those who understand the important of emergency funds will make provisions for it because it is actually a way of protecting the main investement.