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Hola Lucía,
I strongly recommend you to noindex the category and tag pages of your blog. As you say they are considered duplicate content and it is usually very complicated to work that keywords. In fact if I where you I would mark as noindex the following: categories, tags, author, archives and even the pagination of the blog.
I hope this helps! 
Hola Lucía,
I strongly recommend you to noindex the category and tag pages of your blog. As you say they are considered duplicate content and it is usually very complicated to work that keywords. In fact if I where you I would mark as noindex the following: categories, tags, author, archives and even the pagination of the blog.
I hope this helps!