You might find this previous pair of answers useful as a start: What did the Emancipation Proclamation actually do?, by /u/pmaj82 and y'r humble s'v't.

But there are certainly more questions that can be asked, like more depth into legal theories of how Unionists viewed the legal effect of secession, or the treatment of captured or escaped slaves. So please ask more if you like.

Oddly, my Google search in the FAQ for "emancipation" has no hits! Perhaps I bungled the search. You might also try a search in Reddit, using the search box near the top. There are a lot of hits that don't apply, but enough do apply to the US Civil War specifically. Searching for "emancipation" there gets

https://www.reddit.com/r/AskHistorians/search?q=emancipation&restrict_sr=on