Kingdom Come Deliverance is a massive open-world RPG that takes its history and lore from real history. Thus, at the beginning of the game, the main character Henry cannot write or read, especially considering that he is only the son of a blacksmith. However, you can take action and train him.
You will be able to learn to read as soon as you arrive in Rattay. Talk to the merchant and ask him if there is anyone who can teach you. He will inform you that there is a clerk in Uzice who can help you. Note that the Uzhitz is quite far from where you are, so prepare for a long journey and try to find a horse. You will also need 50 pennies to pay the clerk for his knowledge. Talk to him, pay money, read the book, and Henry can start reading whatever he wants. This is especially useful as some books require you to read them before you can learn new skills.
