Shooting in RAW is very handy. I used to shoot mostly in jpg because I couldn't be bothered with large RAW files. But I switched over a while ago.
RAW isn't magic though. You've got to have some data there to work with.
If for example the sky is over exposed and white, even if you slide the "highlights" slider all the way down it's not going to be able to bring back the sky and make it look blue. Sometimes trying drastic actions to correct an over or under-exposed photo just ends up with photos looking not quite right.
That said if you take a decent photo but there are parts of it that aren't quite light enough or bits that are a little too bright, then you can make the most of RAW data.
The other time RAW is handy is when you take a photo but realise that you need to crop it quite a lot to make a good image. But in cropping it you lose pixels. Obviously in jpg, there's less detail when you zoom in, but in RAW, you'll have more detail when you crop the image and enlarge.
Go out and shoot more. You only get better at something if you do it more.