Usage of post categories for own custom post type


I did my own custom post type and now I am wondering if I should use the categories (that are within the posts-menu) for my custom post types and if this is common. How to set the right standard-category to my own custom post types.

What I mean with this: I have a custom post type for abap snippets. This CPT has its own taxonomies. I am wondering now it I should also use the standard category mechanism? It could be good for the breadcrumb or something else that I don’t know. Sorry for this question but I am a newbie and currently there is more darkness than light.

Thanks a lot, Sascha