When looking for electrical safety tips, you probably read about the importance of giving your space heater safe room to breathe. Flammable items, especially, should be kept at a safe distance. Most space heaters have a function to turn off when they overheat, but not all appliances have this feature. Do a quick Google search and check your manuals to see which ones may require air circulation.
One that you are probably already familiar with is your refrigerator. Another is your computer. Resting a laptop on a blanket for a while can cause it to overheat because the vents can get blocked. The same happens if you push a desktop tower too close against a wall. Devices like these do not always shut off automatically, so the best approach is always to be proactive.