Do I need to separate ajax methods from its main controller?

I don't know if this is a good idea, but, it worked!

Being a developer is one of these weird careers where there are quite few ways to do the same task, so there is no one "true" way of doing things

The more you work on different projects, the more you figure out what clients like to get and how can you make your own life easier as developer, but at first, specially when you are starting out, keep it simple and get it working functionally, rest will come with experience later.