I love gardening, although I'm not such an expert. If you live somewhere with a temperate climate pumpkins are very easy to grow although they tend to take over the whole garden. If you have a big garden, pop some plants in a back corner and let them run wild! I also find silverbeet and loose leaf lettuces very easy to grow, as well as Asian vegies such as bok choy and choy sum as they grow quickly and are delicious.
Tomatoes are good to grow too, especially cherry tomatoes which are so tasty and very quick to grow as they're small. They're also good ones for balcony gardens and kitchen boxes. Basil, radishes and carrots are easy vegies to grow as well. So are zucchinis, although you'll need quite a bit of space as the plants can get pretty big. Just three or four plants are more than enough to feed a whole family over the summer...if you grow any more you'll be giving a lot away to friends or they'll be going to waste.