There're a lot of them, Oracle Database is just one (but it is their flagship product as in common language "Oracle" is often means their RDBMS). After that, you can focus on Oracle products. I think, first you have to learn about the basics of client-server architecture, then about the modern relational-based database systems or RDBMSs (both are Oracle independent thing). It isn't necessary at all for Oracle SQL and/or databases. A powerful (and very expensive) one, but it isn't "Oracle". TOAD is just a tool, an utility software, mainly for database administration tasks, not for programming (can be use to that too, but SQL Developer could be a bit better, for example).
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