Installing Oracle XE is easy and using SQL on Oracle is no more difficult than using SQL on most other platforms. The more difficult parts of Oracle come with larger systems that need administration. The things that make being a database administrator hard mostly do not apply to people in your situation.
The act of binding oneself by a social, legal, or moral tie to someone. obligation(Noun) A social, legal, or moral requirement, duty, contract, or promise that compels someone to follow or avoid a particular course of action. obligation(Noun) A course of action imposed by society, law, or conscience by which someone is bound or restricted.
liability. An obligation that legally binds an individual or company to settle a debt. When one is liable for a debt, they are responsible for paying the debt or settling a wrongful act they may have committed.