Oracle 12c Database software and Installation guide
Oracle 11g Database Link http://www.oracle.com/technetwork/database/database-technologies/express-edition/downloads/index.html Oracle 12c Database Link http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html Oracle 12c Installation guides links https://www.youtube.com/watch?v=juLD9T5GAck (Video) https://docs.oracle.com/database/121/nav/portal_11.htm ( All Operating systems) https://docs.oracle.com/database/121/NXDQI/toc.htm#NXDQI101 (Windows)