The boss of a company often blocks me in front of my house and sends me disgusting text messages. I want to call the police. How can I get evidence?

Keeping the text message is evidence. If you report the case first, you can collect evidence on the spot. For example, if he texts you again, you just don't reply, and then call the police. Just wait for him to block you in front of your house. If he stops you, you try your best to make him show his true colors, and then the police can arrest him on the spot.