If you want to grow your own vegetables (or whatever you like) composting is an important part of your gardening. Basically, any vegetables or fruit etc that you eat, produce peels and so on, and those are ideal for enriching the soil in your garden.
compost
75 Things You Can Compost, But Thought You Couldn't
Informative and useful article about what you can put in your compost. I’ll bet there’s stuff on this list you didn’t know. I know I didn’t.