Post-hardcore is pretty much any type of hardcore punk that doesn't fit the usual sound of hardcore. So It could be anything, but post-hardcore bands usually follow a similar sound. Fugazi, Embrace, At The Drive In, Hüsker Du, etc are post-hardcore.
Post-punk does the same thing for punk rock, only it has an entirely different standard sound.
Alternative Rock can also actually be anything that doesn't fit the usual rock, but a lot of bands in it also happen to have a similar sound of which you can say ''yeah, that's alternative rock''.
Genre tagging will always be difficult. In fact, in my music library which I like to tag as well as possible, I ditched trying to have correct genres altogether. Especially since in my music player you can put in multiple genres. It'd take ages to get it right, and I wouldn't be sure if it was right anyways. On some bands genres can be really obvious, on others it can get a bit subjective.
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