If your plan with bitcoin is long-term, choose to buy with the idle money you have at any time, there is nothing to worry about. If your plan is short-term, take advantage of the opportunity to buy dips to wait for bitcoin's support waves. Basically, depending on the conditions and plans, I will arrange and proactively buy when bitcoin is at a price that I feel is acceptable.
It is never a good deal to advise a newbie to invest in bitcoin for a short time because there is no possibility that he will get a profit. Mind you, if you really want to get profit in bitcoin, then it has to be for a long period of time, and if you are to invest for a long period of time, you don't need to wait until there is a dip so that you can buy. That is why there is a DCA strategy that will help you to accumulate as much as the number of bitcoins you need, which you can buy bitcoin bit by bit and accumulate what you need.
NOTE: Most people that buy bitcoin in a short time are likely to lose, although some also gain profit, but as a beginner in bitcoin, it will be very hard for you to gain profit in a short time because it deals with a lot of analysis and research, so the best as far as I am concerned is long-term investment.