One of the best aspects of this forum is the ability to ask a question and get honest, simple, down-to-earth answers that are informative and easy to understand.
For years I've seen references to physical security keys like Yubi keys. I've always been big on security. I use 2-factor authentication anywhere it's offered, even if many sites employ it in a way that makes it inconvenient and cludgy.
Based on what I've read it seems that Yubi-type keys provide the same basic security that 2-factor does. The key is registered to you (somehow) and the fact you have it in your possession and