When adding a node, the site images do not show
It seems that the root of your Drupal site is http://localhost/bedsastro_new/ .

To reference an image with filename pic.jpg (using an img tag) which is located in the site's subfolder named assets/site-images, you should specify /assets/site-images/pic.jpg as the value of the src attribute within the img tag.

With that, Drupal will try to find that image at http://localhost/bedsastro_new/assets/site-images/pic.jpg, which is where your image is actually located, so that should work.