That's how I found out that the below yellow flower is Sundrops, and the white ones are double Feverfew. They could be carnations for a doll party.
And these are Spreading Dogbane (I think), which upon reading looks to be kind of nasty stuff and bad for ruminants.
I'm pretty psyched that I was able to identify all these new-to-me flowers! Notably, it took an hour or so of uninterrupted concentration to find two of the five, the bellflower and the dogbane. I think it's because I wasn't using the system properly. Once I settled down and went through his steps in order (and didn't just skim the section looking for a picture that matched), they kind of fell into place.