Best way to invest $ as a beginner

[Alexis Marie]

What would be the best way of investing $15-20k as a beginner who's never invested before, to get the most return & make way for future investments? Right now I'm mainly focused on rental property (single family but also I'm thinking of mobile home parks or small multifamily duplex or 4-plex), but I'm open to hearing other options. I want to invest wisely while setting myself up to grow a portfolio successfully.