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Understanding how to go about Bitcoin investment is one thing and doing it I mean putting work to it also another thing because there are a lot of people out there that knows how to go about Bitcoin investment but yet they don't have any reasonable fraction of Bitcoin in their portfolio. Yea keeping your discretionary, emergency and back up funds are very necessary in Bitcoin investment because those are things the will aid a good investment if everything other thing are put in place. I wish you good luck on your investment and don't always be in a rush before you get yourself messed up.
Everything that concerns ourselves and our own lives must always have continuity as a whole so that every job we do can continue to run smoothly, especially if the job has a target that is not short like in Bitcoin investment which most people often apply for the long term. So to support it to run smoothly on the path we are currently on, of course everyone must have a reserve fund, emergency fund, and discretionary fund for their own life so as not to interfere with the funds that will be placed into Bitcoin investment at the same time.
That is why we must impact crypto knowledge to our generation to improve in any investment they may find themselves in the future. We need to teach them when to buy and where to sell to earn different profits with other investors, and once you train your children in this way, it will be difficult for your children to ignore bull run when it is time to sell because that is the best season to earn massive profits from crypto investment.
Emergency money is very important to every investors, there are some that sold their coins waiting for bear run to occur before they can buy again , but don't use all your money to buy BTC, make sure you reserve emergency money you can use to solve other issues in case without selling your BTC at the moment.
In my observation you are describing trading which is gambling than investing, because for investing there is no best time to buy other than when you have your investment money available, bull run is not just time to sell an investors can still be buying Bitcoin even in a bull run, those that emphasis on selling on the bull run is that of the traders and not investors, it will more better for us to teach our children investment for long term and it's principles than teaching how to buy and sell for short term profit.