Snip
Once again DCA is not strategy of holding bitcoin, It is a strategy of buying Bitcoin. Another mistake you are making about DCA is were you are saying, buying a fixed amount of bitcoin every week or month. Instead of fixed amount of bitcoin, it is a fixed amount of money.
If you say fixed amount of bitcoin it might be difficult to achieve it, as you will be going against your budget to buy when the price of bitcoin is high in the market. But with fixed amount of money, you can always stay in your budget and buy irrespective of bitcoin price whenever you want to buy.
You are actually correct about your analysis .Bitcoin should not be bought on a specific fraction, like saying you will be buying 0.000756
BTC every week. because Btc price changes overtime because that same fraction of bitcoin might change in price maybe from 0.000756 of $32 to $37 next week, which your salary remain constant. your budget for emergency will be tampered by $5, making it difficult for you to achieve your goal.
Yes as a newbie all you need is the basic knowledge of knowing how to set up your wallet and how to buy bitcoin from exchanges both Dex and Cex and knowing who to withdraw your bitcoin to your wallet. Also to know that you are not to keep your coin in an exchange for long because it's dangerous
For me I think CEX is more preferable to buy coin than Dex because of the transaction fee. Like now if you want to buy bitcoin, you buy on vex and send to Dex like a place of store and it will save you the cost.