Long read and a lot of images:

An object with overhangs over 45 degrees normally requires supports to be added before 3D printing. Choosing the right support settings and structures is a skill that needs to be learned when using desktop SLA and FDM 3D printers. Here is a few examples for comparison and give you some ideas.
5 Major slicer software: Cura, Simplify3D, PrusaSlicer, Meshmixer, Chitubox