IftiBashir wrote:
When should each be used??
Folder can be used to store either projects or albums, to better organise, I assume.
When should an Album be used, and when should a Project be used??
Right a folder is an organizational tool, it doesn't directly hold images. You use it much as you do outside of Aperture in the finder to organize similar files into cohesive groups.
Projects are Apertures top level images storage box. Every image has to be in a project and (except for exceptional reasons) in only one project. A number of users (myself included) feel that 'Projects' have been misnamed. To most of us a project is a collection of images you put together for a particular goal. It may be long lived or it may come together for only a short time.
Projects in Aperture are more like the negative carrier that you put your negatives into when you were shooting film, only they'll be easier to find and organize. So Projects are where you put your digital negatives when you import them into Aperture. How you label them and how you decide which negatives go into which Project is a highly personal decision. Some do it by date, some by content, some by shoot. You'l need to come up with a scheme that makes sense to you.
Albums are where you bring images that relate to each other together. So you could have an Album that contains all the images of you dog or of the trip you took last summer. Or it could be an album of images you are currently working on. Images can be in multiple albums, you can remove an image from an album without removing it from other albums or the project it lives in.
This is a basic description. I'm sure others will jump in with there ideas. If you have any more specific questions let us know.