As with any wild animal it is best to leave it in its natural conditions and enjoy it in its natural settings by attracting it to your house or garden. If you are interested in keeping a frog/toad, you must first check to see if it is protected by local or national laws. In the U.S.A. you should check first if the animal is listed as endangered or threatened under the Endangered Species Act. If not, it may still be protected in your state by local laws. Check with your state department of environmental conservation/natural resources/fish and game etc. Next you must set up a terrarium (ideally this step should be taken before the animal is taken into captivity). The best way to go about this is to have some sort of base substrate in an aquarium that the frog/toad can dig into (e.g. unfertilized peat moss). Provide also a hiding place and a source of water.

Terrestrial species will need only a water dish while more aquatic species will require a large water area. The terrarium should have a secure lid - some toads are good climbers, many species of frogs will be able to jump out and treefrogs will be able to crawl out of the aquarium.

Provide adequate lighting. All frogs and toads eat only live food and will recognize an object as food only if it moves. They will eat insects of various types. The easiest available commercial food that you can get will be crickets. However, some species enjoy earthworms and these can be cut into smaller pieces for the smaller species. You can also collect insects and other invertebrates to feed these animals, but make sure the area hasn't been sprayed with pesticides. Feeding behavior will vary among species so it is best not to have very different species in the same terrarium. Not all species adapt well to captivity; if the animal refuses to eat or eats poorly release it where it was caught (never release an animal into an unfamiliar environment).