Guides for posting effective Carex sp. (true sedge) observations

I find myself often taking photos of sedges on my hikes in Ontario because I quite like them, but I realize that there are many species of true sedge, Carex sp., in my area and that I don’t know how to confidently ID any. I’m also not sure if they all can reliably be identified by visual features or separated from one another.

Are there any good guides out there for how to pick out certain features of sedges to aid identification by photos, etc.? I’m partly interested in actual identification guides but my main goal is to see if there are any guidelines that can be followed to ensure that iNaturalist observations of these species have the best chances of being correctly identified to species level. Either to allow an inexperienced observer to figure out what to look for to learn ID or to make it easier for more knowledgeable sedge IDers to do their thing.