can programs like after effects or hit film make effects in program and not pre made effects or models? I always say can you draw in the program. Draw an effect or model
Hitfilm and After Effects both allow users to highly customize the built-in (or plug-in) effects. Creating new effects would require writing program code to the specifications of the host. Neither program contains tools for building 3D models.
It also depends what you specifcally mean by 'effects'. The main point of HitFilm (and AE) is to make it possible to design and create custom effects, using the tools provided. (much like all kinds of buildings can be constructed using the same selection of hardware tools)
If you're talking about creating your own effects plugins, then that's a separate thing, as Triem says.