Being an Ethical Behavior Analyst
To be a behavior analyst means you adhere to the ethics code put out by the Behavior Analyst Certification Board (BACB). Navigating it can be a rocky path, but if you keep in mind the idea of "Do No Harm" as you practice and continually refer to the code, you will be fine.
Scope of Practice
Make sure that you are practicing only what you know. If you there is something that comes up that you haven't studied find a mentor to help you navigate until you have learned more. You can do harm to the client by practicing outside your expertise. Refer to the ethical code for guidance.
Locations for ABA
ABA can be used anywhere. Typically, you will practice in either a clinic, a school, home setting, or the community. Some skills are easier to teach at a table, such as handwriting practice, but to better generalize skills, you should be teaching in all environments.
Use Reinforcement First
Despite what you might hear, ethical behavior analysts use reinforcement above all other things. There was a time in the past when that wasn't the case, but like all science, we evolved. Consider reinforcement first and only after you've exhausted every possible intervention using reinforcement should you consider using punishment.