buy buy or sell sell is just a thread like any other thread, there is nothing too big about the whole concept of bitcoin accumulation. first an foremost you must  have a purpose to which you want to accumulate bitcoin for. it may be for creating wealth or your retirement for old age usage or to pass it as inheritance for the future generation. it may be long or short term investment but the target is the amount of bitcoin you may be able to accumulate in that short or long period of time. surely bitcoin accumulation is just a process or way of buying bitcoin bit by bit according to your discretion. for example if you are a worker who earn money every week or month, instead of saving all your money in the bank, you may likely start to invest little by little every week or month which is otherwise known as DCA. for example you earn like $500 per month, you may decide to invest as low as $10 or $20 per week making a total of $40 or $80 per month. the main purpose of this investment is for future use since bitcoin is a volatile asset. or a store of value which could be transferred to your children or to your loved ones. there are many things to explain but for now this the few i can tell you about bitcoin investment.