Do landlords usually have homeowner insurance?

Do landlord usually have homeowner insurance? Also is it true that most homeowner insurance have liability coverage? And if they took out a mortgage does the mortgage company require them to have some kind of homeowner insurance?

Yes, if they have a mortgage they are required to carry rental property insurance if not the mortgage company will forceplace insurance on the home which only covers the loan. They come with liability coverage yes. Anywhere from 100,000 to 300,000 liability coverage. That would be in case someone sued then for anything.