Choose vegetables that are easy to grow. Since this is your first garden, your best bet is probably to stick to easy-to-grow plants like radishes, cucumber, lettuce, peas, beets, tomatoes, and Swiss chard.
Plant vegetables that thrive in heat if you live in a hot climate. If you’re in an area that has a long, hot growing season, hardier crops like corn, okra, peppers, sweet potatoes, beans, tomatoes, and melons are a good choice.
Peanuts also do well in hot climates.
Stick to leafy greens if your garden is in a shady spot. If you don’t have much space and your garden is in a shady location that gets less than 6 hours of sun daily, you can still have a great gardening experience. Swiss chard, spinach, and kale do well in shady areas. You could also plant radishes, rhubarb, scallions, and potatoes.
Talk to other gardeners about what you should plant. Long-time local gardeners are a wealth of information about what grows well in your area and what does not. Consider joining a horticultural society to gain access to these veteran gardeners, and ask them questions about gardening to help you decide what to grow.
Online forums are also a great resource that can help you decide what to grow.