I personally don’t like discouraging newcomers away from more challenging species. However, ask yourself these questions.
1. Have you successfully kept beginner species such as bull frogs, horned frogs or whites tree frogs?
2. Are you comfortable culturing fruit flies and micro fauna such as spring tails?
3. Do you understand the very specific husbandry requirements of dart frogs?
4. Can you commit time each day to ensuring constant conditions in a vivarium?
5. Do you have the funds for the initial set up.
6. Who will feed and mist your frogs when you are away?
7. Are you willing to maintain more than one vivarium if a certain frog needs to be separated?
Dart frogs are not necessarily difficult but they are not as forgiving as many beginner species. There are quite a few nuances between different genus, species and individual frogs. My advice would be to start with firebelly toads or green tree frogs and work your way up. Do plenty of research and be ready to commit before acquiring any species. Personally I wouldn’t recommend any darts for a first time frog. But once you’ve mastered care of easier species any of the phylobates genus are good beginners.