One minor thing may be worth mentioning: different brands tend to make shoes that fit differently. From your other footwear, you may have got the sense that your feet are relatively wide or narrow, or you may have got the sense that they're relatively high volume (aka high instep). If you have feedback like this, ask someone at the bike store for help. However, be aware that not everyone at the store may be knowledgeable about this, because bikes and human bodies are complex and not everyone may know everything. If your feet are especially hard to fit, ask for someone knowledgeable.

My impression is that Specialized, Shimano, and Lake have tended to have slightly wider toe boxes, i.e. the front of the shoe. Sidi shoes in general and most Giro models tend to be narrower. That's not a comprehensive list, it's just what I recall. Many brands make wide or high-volume versions of their shoes if you want to go that route, but bike stores may not have those versions in stock.

If you fall or crash, my experience has been that you come unclipped in the process, even if you have set the release tension relatively high. I realize that a non-cyclist might think that this sounds oblivious to danger, but I can attest that it is so.

A last minor point: there is absolutely nothing wrong with 2 bolt shoes on road bikes if you want them. If you're with a serious roadie group, you will be going against convention, but you can decide if that matters to you or not. I subjectively feel like my road pedals are a bit more stable than my MTB pedals, but the difference isn't large. I'm not sure it would be detectable in a lab. On my smart trainer, I've done functional threshold power tests on both road and MTB pedals, and performed pretty closely.

One minor thing may be worth mentioning: different brands tend to make shoes that fit differently. From your other footwear, you may have got the sense that your feet are relatively wide or narrow, or you may have got the sense that they're relatively high volume (aka high instep). If you have feedback like this, ask someone at the bike store for help. However, be aware that not everyone at the store may be knowledgeable about this, because bikes and human bodies are complex and not everyone may know everything. If your feet are especially hard to fit, ask for someone knowledgeable.

My impression is that Specialized, Shimano, and Lake have tended to have slightly wider toe boxes, i.e. the front of the shoe. Sidi shoes in general and most Giro models tend to be narrower. That's not a comprehensive list, it's just what I recall. Many brands make wide or high-volume versions of their shoes if you want to go that route, but bike stores may not have those versions in stock.

If you fall or crash, my experience has been that you come unclipped in the process, even if you have set the release tension relatively high. I realize that a non-cyclist might think that this sounds oblivious to danger, but I can attest that it is so.

A last minor point: there is absolutely nothing wrong with 2 bolt shoes on road bikes if you want them. If you're with a serious roadie group, you will be going against convention, but you can decide if that matters to you or not. I subjectively feel like my road pedals are a bit more stable than my MTB pedals, but the difference isn't large. I'm not sure it would be detectable in a lab. I don't believe that an XC mountain bike shoe is more flexible than a road shoe of the same price point, although I have no experience with non-XC shoes. On my smart trainer, I've done functional threshold power tests on both road and MTB shoes pedals, and performed pretty closely. My off-road shoes have a nylon sole, vs the mid- to high-end carbon sole on my road shoes to boot. I also don't perceive a huge difference between power transfer in each shoe.