You can do a lot of gardening, or a little. But whatever you do, make it count. This site is organized by Monthly Tips, each with categories on annuals, perennials, bulbs, lawn care, and much more.
The monthly tips are based on the central U.S. zone, but all the information can be used in your zone. Simply adjust for your local conditions.
You'll find those easily from the U.S. Dept. of Agriculture at the Reference page or in the Smart Gardening Resources table of links below. There's also a wealth of planting information at these links, as well as a quick way to check your local weather forecast.