Everyone likely has to have some level of back up funds to start to buy bitcoin.  Otherwise, how are they going to know if they have covered all of their expenses.  If they use all of their discretionary funds to buy bitcoin, then they have no money left in case there are more expenses before the next time that they are paid. 

It is true that back up funds (or emergency funds) can be built at the same time as bitcoin is being bought, but it would be reckless to start with absolutely zero back up funds.

How great our portfolio will look like or our investment, doesn't only depends on our source of income but rather it also depends on our expenses because even though we have a great source of income ( huge source of income) and the expenses to handle is not small or little there is no way our portfolio or our investment will be great because our discretionary will be very small after taking care of those expenses but if our source of income is huge and our expenses is little our discretionary income will increase and this will affect our investment positively.

That is why it comes very handy to segregate your essential expenditures from non-essential ones. We have to understand that spending money on latest iPhone 17 pro max is a non-essential expenditure which can easily be avoided and that money can be invested in Bitcoin to increase our profit in the long run. If you have a list of expenditures that is mixture of essential and non-essential spending's then at the end of the day you will save a very small amount of money for investing in Bitcoin. If you have room to increase the amount of money that goes into Bitcoin by cutting spending's on unnecessary things then why not increase it.

I am still suggesting to build your back  up funds from whereever you are at and not creating an extra expectation that you should have more back up funds than you have, so you figure out how much you are going to put into bitcoin and how much you are going to put into back up funds at the same time, and build from where you are at... There is not an extra priority given to back up funds, even though guys still have to figure out their own comfort level in terms of how much to put into each... So a guy starting out with absolutely no back up funds will be in a more delicate situation as compared with a guy who might already have two weeks of his expenses in some kind of a reasonable back up fund... The guy with two weeks of expenses already saved up might not have to dedicate 50/50 to bitcoin and to back up funds, and maybe he decides to put 80% of his then existing discretionary funds (presumptively from his income) into bitcoin and 20% into back up funds.

Let's start with your basic needs, and if you are calculating that correctly, then you have $200 remaining for your monthly discretionary funds.  One of the reasons I suggest that you might not be calculating them correctly is that there is a difference between needs and wants, so you may well be including discretionary consumption into your "basic needs."  That is for you to figure out, and part of the reason that I suggest that guys divide their discretionary funds into three categories is so that they account for their discretionary consumption, which nearly everyone should have, unless they happen to be a hermit and/or living the life of a hermit.. which most normal people do not want to live the life of a hermit, and we should not have to live the life of a hermit in order to invest into bitcoin.

In other words, you are using only two of the categories, $100 for investing and $100 for savings (back up funds).  Savings/back up funds is the same thing, even though you might label them as having different priorities, so some guys might have emergency funds that they cannot touch absent some kind of an emergency, and they might have reserve funds that have more flexibility in terms of how you might use them.. but they are all forms of back up funds, and it is up to you what level of priority you give to them and how much you might want to or be able to stop yourself from tapping into them as you are building them up, presumptively.

If you have $100 per month into each category (investing/saving) then you could divide that into weekly if you want which would be about $23 weekly (since on average each month has 4.33 weeks).

Of course, you can start with certain amounts that you had figured out to be $200 per month and then see how it goes from how you divide it and how it might be building up with time, yet from your description, you may well need to better sort out your expenses (which you described as $400 per month) to determine which ones of those expenses are actually basic and which ones are discretionary (which ones are your needs, versus your wants).

Practice will help you, especially if you can continue to both take action and to keep track and to make adjustments to make it more comfortable for you... and of course, investing into bitcoin takes money away from your consumption, yet if you keep track you might consider it to be a good way of using your money.. and of course, you have to ultimately be comfortable with how much you are stacking away each week or whatever period you end up buying bitcoin with your funds.

But from my own view, using the DCA strategy is the best way for beginners because new people don’t really understand the market situation well. So after entering the market, if they can learn a bit about bitcoin, it is better to start by investing in bitcoin through DCA. At the same time, while investing with DCA, if they keep learning about the market and also understand bitcoin properly then that will be the best approach.

If you can't figure out what are your essential and non-essential expenditures then it wont be easy to spare money for Bitcoin investment. Its very important to understand that a 10$ and 100$ watch both will tell you same time and its better not to invest on such luxury items but to save money and invest in an asset that increases its value over time i.e. Bitcoin. In case you have a huge list of items on which you have to spend money then how can your discretionary income be used for Bitcoin investment? Cut down your expenditures on non-essential items like I mentioned and that will help you in investing in Bitcoin.

Best to those who have money, because you need to save plenty of money before going into DCA strategy. Using the strategy to accumulate BTC is good but you must keep your seed phrases safe, because if your wife or children find the seeds phrase you will regret, because they have the right to have way to your BTC anytime or any day.

There is a way you will impact a newbie they will be happy for using this strategy to accumulate BTC, because it hard for those people using this method to accumulate BTC to loss. You will not see them selling BTC when the price is low, because they have pay the price to hodl BTC for long years before they can sell.

This is very wrong, who told you that you need to save plenty of money before you can start using DCA strategy. With the DCA strategy you don't need to have or save plenty of money before you start using the DCA strategy.