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Dont make things more complicated. I believe there is no one here who dont know the essence of having a discretionary income. And yeah, your description of it may seem to be unclear. For better understanding, any money use to start an investment or a business is called a capital. The total discretionary income, after completing your goal can be said to be the capital invested. You can choose to put the capital once if you have it, that is if you are using lump sum. While DCA actually means spreading it across several periods.
I also think why some people who intend to become investors explain more about capital and the use of capital here, which even the explanation looks so complicated that it is more difficult to understand for those who want to try buying Bitcoin this year. Even though everyone must know about initial capital and also preparing funds for themselves in life when they want to become investors by using one of the wise methods that is not burdensome for them. Because in terms of investment, there must also be three important things besides capital, namely consistency in buying it and also not easily panicking when there is bad news and must have high patience in holding it for a long time.