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Would you suggest editing your photos? I have a very basic NIKON camera, so I do not think if I am not shooting in RAW I would be able to change that. BUT I am always willing to improve my photography, because it is something that I enjoy. Any suggestions?

I definitely would. Even photos in jpeg can be edited although I recommend doing it in RAW because that would give better quality in the end. I'm quite sure even with your camera (D3300 right?) you should be able to shoot in RAW. If you then download the ViewNX software from Nikons website you could import and edit the photos real easily. If you want to progress in photography (I basically feel photography is all about improving your skills anyways) you should for sure edit them. It will give you instant better looking results!