These are the law itself: case law and legislation / statutory instruments. For case law, remember the doctrine of precedence applies!
These are commentary on the law: journal articles, textbooks, etc.
While it may be tempting to think finding things will be quick, often to find the authoritative sources will be a long process and involve many searches.
Google Scholar is a great starting point, but it isn't a database in itself, and it also only searches through a few of the legal database.
A summary of the different databases and what they contain is as follows (those in blue are South African orientated, while the green ones are international / foreign databases).
Consult the library's other guides for more help with finding materials: