Can you do well with short blog posts? Like 300 words?

Hi All,

I'm thinking of starting a technology/movies/TV blog as a kind of side project. Would probably write 2 or 3 300 word articles a week. Do you think this could gain traffic over time? My current project is dropshipping so to be honest I dont know anything about the blogging world, it just looks interesting.

Thoughts?

Also, would it be a problem having technology AND movies/tv as topics? Or would I need to pick one.