As a new user, you can get started with Bitcoin without understanding the technical details. Once you've installed a Bitcoin wallet on your computer or mobile phone, it will generate your first Bitcoin address and you can create more whenever you need one. You can disclose your addresses to your friends so that they can pay you or vice versa. In fact, this is pretty similar to how email works, except that Bitcoin addresses should be used only once.

How is BTC all the more rare when more has been mined? That doesn't bode well from a mining point of view alone. Obviously if there is a relate increament in the quantity of clients, the measure of BTC spread between these clients will become progressively thin as the rate of development surpasses the rate of mining

How is BTC more scarce when more has been mined? That doesn't even make sense from a mining perspective alone. Of course if there is a correspond increase in the number of users, the amount of BTC spread between these users will grow increasingly thin as the rate of growth exceeds the rate of mining. I think it's good to have news about bitcoin, as it might trigger FOMO as you say, but I doubt it will have such an effect.