is it safe to manually delete unused assets?

i’m asking about the individual Materials/Meshes/Shaders/Prefabs that come with an asset pack, i’m new to Unity and i have been importing asset packs from the asset store all over the place, but i usually only need 1 prefab or two from each pack in my project. So is it safe to delete the others to make it smaller?

Some pointers here: What is your process for dealing with unused assets?

I import into a separate project then only export the used ones into the main project.