Begonias are the perfect plant to start your garden. They grow quickly and easily fill in spaces that would benefit from flora and color.
Full sun locations during hot summer days may stress the plants, so try to keep them in a relatively shaded area. It is important to water them correctly; soil should remain moist, but not too wet. Once you understand how to take care of them, they are relatively easy to maintain.
You can find out more details about how to take care of them here: https://www.gardeningknowhow.com/ornamental/flowers/begonia/annual-begonia-care.htm%EF%BB%BF