@Karla Barbacena Congrats on starting your journey into real estate investing!
That question is very loaded and complicated. Everyone's situation is different, and the truth is, it depends.
If you're looking at more than 4-unit properties, you will most likely have to have a legal entity to get financing (LLC, corporation, etc.). However, if you have 4 or less units, you may be able to keep it in your personal name. It varies from lender to lender. Some won't lend on a residential property (less than 4-units) with a conventional residential loan product, while others will.
If you do decide to keep the properties in your personal name, I would highly recommend getting sufficient (and likely even more-than-sufficient) liability insurance. I would get insurance to essentially replicate the liability protections of a legal entity, like an LLC. In regards to tax benefits, I would recommend talking to a quality CPA in your area.
Robert Leonard