If you are home alone and your house is on fire the first thing you should do if possible is to get out of the house such as through a window, door etc.
Then when you're safely outside call 911 and report the house fire and do not go back inside the burning house for anything.
If you cannot escape the house you need to call 911 if you have a phone to call 911 or holler out a window for help but if you have a phone call 911 and also holler for help so that someone can hopefully come to your rescue before the fire department gets there.
Someone might be available to help rescue you from the burning house and save your life so always holler for help but also call 911 to get help on the way.
If you're in a room that has a door and smoke is coming under your door into the room and you cannot escape that room right away you should stuff towels or blankets by the door to stop the smoke coming in.