Worried about taxes when investing in Multi family apartments

[Jacob Song]

Hello, I am a newbie to Real Estate business and have many questions. Before I was getting all excited about real estate investing, my mom was saying you will be paying lots of taxes if you don't live in it. My mom have 2 single family houses which causes for second house property to be taxed a lot more than before. So question I have is that if you buy a multifamily house to give rent to others does it also count as second mortgage which will cause it to get taxed a lot higher? Or putting it as an LLC will make the tax smaller than putting it as your resident building? Is there way to find out how much exact taxes I'll be paying if I buy the property?