The main point is that you shouldn't try to anticipate what parts you will need more than a couple weeks into the future.
No doubt. You could easily wind up spending a TON of money if you do that! Not to say that I've never bought something on totally speculative basis, of course... :-)
Last year I started with a small ESP32/WS2812B project, after that was finished I wanted to get an understanding of how all this electronics stuff works and also get an understanding for embedded programming. Now I'm sitting here with lots of electronics components, some PiPicos, ESP32 boards and my newest addition, some STM32 Nucleos. :) I think I should really sell some of this stuff and only concentrate on one project at a time.
No doubt. You could easily wind up spending a TON of money if you do that! Not to say that I've never bought something on totally speculative basis, of course... :-)