A Practical Guide to Evil is a Manga/Manhwa/Manhua in english language, manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The Empire stands triumphant. For twenty years the Dread Empress has ruled over the lands that were once the Kingdom of Callow, but behind the scenes of this dawning golden age threats to the crown are rising. The nobles of the Wasteland weave their plots behind pleasant smiles while rebellion stirs beyond Peren Woods, for dreams of crowns were buried in shallow graves. The greatest danger of all lies to the west, where the First Prince of Procer restored order at last: her people sundered, she ponders if a crusade might not be the way to secure her reign. Yet none of this matters, for in the heart of the conquered lands the most dangerous man alive sat across an orphan girl and offered her a knife. Her name is Catherine Foundling, and she has a plan.