That’s really going to depend on the species you get. Care requirements can vary dramatically between species, and even from individual to individual. Some are terrestrial and will require low, long terrariums with room to burrow, while other are arboreal and will need climbing space.
Petunia is a rose hair tarantula, which is among the most commonly available, docile, affordable, and easiest species to keep. However, most potential specimens you will find on the market are wild-caught, which I strongly disapprove of, so, if you can, look for captive-bred spiders. Theoretically they burrow, though Petunia has never shown interest in doing so with me or her previous owner.
The same goes for the Mexican red knee tarantula, which is probably the prototypical tarantula in most people’s minds. They’re beautiful, easygoing, and simple to care for, but they are slow-growing and near-threatened in the wild, making adults rather expensive to acquire. Captive-bred spiderlings are a lot easier to get, and I’ve been considering raising one at some point.
Those are the only two species I’ve really spent much time researching care for, but if you look up “beginner tarantulas”, there are many other recommendations.
Keep in mind that female tarantulas are often very long-lived. A female rose hair or red knee can live to be 20 years old in captivity. Males rarely live more than five years. A female tarantula is a long-term commitment to a very stigmatized pet that you might not be allowed to keep in some living situations.
Try the Arachnoboards forum for more care advice.
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