Is Buying Shares of a BTC ETF a good way for non-tech new (late-to the game) investors to invest in BTC?
Honestly it could help you watch or observe how the market works and how it affects your money but as a beginner I personally did not had to go through all this. I just studied and even without being too tech savvy you can learn how and where to buy your bitcoins and to hold them securely. I hope you can just hold bitcoins on your own.