koobas.hobune.stream
Do I need DirectX?
I'm a beginner in using game engines in general. Do I need to use directx or any 3d graphics API in general, with Unity to develop a game? or just use unity and don't need anything else?
Just Unity. All the rendering part is handled inside Unity itself, using OpenGL (not quite sure about that one !) without you seeing it. If you can use OpenGL functions in scripts when need, it's quite rare. But you don't "juste need Unity", unless you want a game made of boxes, spheres and capsule :p
So it's at least Unity + 3D modeler + 2D software.
