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Many of the good images of wildlife are taken in areas where the animals are accustomed to seeing people. Wildlife Refuges, National Parks, sanctuaries, etc. Almost all of the excellent wildlife photographers study the species to learn as much as they can about the habits, diets, shelters, loafing areas, breeding, nesting etc. of the species. Armed with this knowledge they are more likely to get better results. Just wandering around in the woods or sitting and waiting for something to walk by isn't the way to go about it.
Knowing your equipment is also essential. Knowing what you will need and how to operate the gear gives you a better chance of success. . Practice on tame subjects, like in a zoo can show you what to do and what not to do.
I hope this helps a bit.