What specific registrations and legal documents, such as sales tax permits and privacy policies, are required to open an online store in the US?

With 15 dollars, I want to start investing in Bitcoin. What methods can I use to buy bitcoin in small amounts? Can I trade through AIP? If yes, then what are the risks and advantages involved in this?

My mother is suffering from depression; right now she is not under any medication. She has a health insurance policy from Aetna. So my question is: If my mother is hospitalized because of depression, then what is the proportion of inpatient treatment costs that is refunded? Are there any restrictions on the yearly coverage for them, and are some treatments given preferences?