Should I buy house with cash or mortgage it?

[Rufus Crumble]

I have a lump sum of money that I would like to invest in real estate. I am a true beginner and I’m wondering should I buy the investment cash and fix it up and either rent it or flip it or should I take out a mortgage fix it up and rent it or flip it? Based off where I live if I purchased cash I would still be able to fix it up with what I have leftover. But then all of my cash would be tied up in that property. My goal is to continue to buy more properties after my 1st one. Any help would be appreciated!