I highly recommend "Quantum computing for the very curious"[0] for an introduction to quantum mechanics. I went through it years ago and can still remember the main ideas thanks to the built-in spaced repetition.
It is remarkable how everybody only seems to comment on "spaced repetition" rather than anything involving quantum computing when they discuss that site.
Regardless, memorizing a few facts won't help with reasoning about "is quantum computing even possible".
[0] https://quantum.country