Bird watching is an activity that comes naturally to us humans.
Our ancestors watched birds, and this habit helped them to determine the seasons and predict the weather. Birds still foretell the changing seasons by their northward and southward migrations. And birds often have feeding frenzies of their own just before or after a blast of bad weather.
So, in case, you want to throw out your calendar and the local meteorologist, go right ahead - and you'll still have the birds. For example, birds before the rain fly very low picking up the fat worms from the soil.
In a nutshell, sunflower seed is the best. So if you're just starting out in feeding, I suggest you buy some black-oil sunflower seed at a local hardware store, feed store, specialty bird store, or even at a major retail chain store.