I was wondering how can I eliminate the black stripes when I render HDRI textures. I'm new at the HDRI world.
Alternately, you can use a map node with HDRIs, just as easily as image textures. Go to your world tab in your node editor, and plug it into your HDRI.
If you are learning to use HDR, use a proper HDR image that is meant to be used for a 3D rendering.
You need an image that covers a range of 360 degrees preferably in equirectangular projection or Quadrilateralized spherical cube
In other words: a panoramic image that you can use as the world. Think of it as a large sphere that surrounds and lights your scene. It has to contain the information of the ground and the sky all around.