@Milece - I've deleted your other duplicate post and moved JimmXinu's response here. As JimmXinu says a custom column is how most peole keep track, or use a Tag. And you can use the Goodreads Sync plugin if you want to sync keeping track of your reading with shelves no the Goodreads website. Or indeed use the Reading List plugin in various ways. Lots of things already exist for this...
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