Thank you so much for the response! It sounds like either one will be a massive upgrade from what I currently use (Kyocera Hydro Air).

This is going to sound like a stupid question, but would this one at Best Buy be considered the A1 or retail version? I see that it's branded AndroidOne on the photos, but it's not mentioned in the description. I'm wondering if they just pulled stock photos for it. This is the Amazon version I'm looking at.

YouTube tutorials for this kind of stuff are usually always shitty. I suggest against following any of them. The official wiki install guide is absolutely fine except for the need to install this copy partition zip mentioned in the XDA post. Just follow the wiki instructions but flash that zip before the LineageOS zip. The method is the same, once you flash that zip go back to the TWRP main menu and do the LineageOS one, no reboot necessary between those two.

Thank you very much! I figured I could follow the LineageOS wiki one up until a certain point and just add a step. I just didn't know where to do that. Thanks a bunch!

No. They are not bootloader unlockable. Get standard unlocked retail or Android One.

So just be be sure This version of the phone is the one I want to get, correct? I'd rather not spend extra for the Android One variant.