You had me all the way, until I got to your last sentence.... and selling is not a necessary basic technique.. especially for beginners and maybe even folks who have been in bitcoin for less than 2 full cycles.
I fully agree with you. The more you accumulate the better it gets. If you see historical DCA chart for Bitcoin then best results are generated if you accumulate for 4 years or more. We can say that the more you HODL then better the results will be. Of course we don't know whats lies in the future but the historical price chart gives us an idea about what strategy we can adopt. As a beginner your first job is to understand the market and start your accumulation cycle.