Check out a local gardening group to learn from experienced people; To look up public resources about what grows well in your area instead of immediately jumping in to trying to keep something happy that has particular care needs. In the US, garden or agricultural extensions, and understanding what 'USDA grow zone' you live in, go a long way towards selecting plants that will thrive in your area and set you and your garden up for success.
Adding to this, you won’t necessarily know what a plant is saying right away when it looks unhealthy. Other gardeners can help; but also as you get a few seasons on with plants, you’ll learn better how to understand them.