How create new user in sql developer?

Question

so i tried creating a new user in SQL developer, under the worksheet section,  for a 12c database
create user Hares1
identified by book;
but I get this error
SQL Error: ORA-65096: invalid common user or role name
Sorry I know this is a generalized question. I only learned how to actually connect today - any help of a next step would be appreciated.

Answer 1

so i tried creating a new user in SQL developer, under the worksheet section,  for a 12c database
create user Hares1
identified by book;
but I get this error
SQL Error: ORA-65096: invalid common user or role name
The 'next step' is RTFM. Sorry but for 12c multitenant you simply MUST read the documentation about the new multitenant architecture.
Your 'problem' is not creating a user with sql developer - it is how to create users in 12c.
See my extended comments and reply in this thread (and several other threads I reference there) which addresses your exact problem
12c: ORA-65049: creation of local user or role is not allowed in CDB$ROOT
http://www.oracle.com/pls/db121/homepage
I suggest you first read chapters 17 and 18 of the Concepts doc about the new multitenant architecture of 12c.
http://docs.oracle.com/cd/E16655_01/server.121/e17633/part_consol.htm#CHDGDBHJ
The 'Common Users in a CDB section answers your question
>
The name of every user-created common user must begin with the characters c## or C##. (Oracle-supplied common user names do not have this restriction.)
>
There are two types of users in 12c: common and local. You need to understand the difference between them.
Until you read those doc chapters you won't understand these terms: common user, local user, CDB, PDB, root container, and many others.
As I said in that other thread:
You will NOT be successful working with 12c unless you have read and understand the new multitenant architecture that it uses. There are very simple things (connecting, startup/shutdown, creation of users, grants to users, etc) that just don't work the same old way anymore.
If you try to just 'plow through it' without reading about it you will likely get an exception that you won't understand and it will likely use a term (CDB$ROOT) that you won't understand. Then you will hunt all over (or worse, ask in the forums) to find out about that term.
Yes - I know how adverse some people are to RTFM replies. But for 12c multitenant it is mandatory to read the docs no matter how expert you may be in previous Oracle versions.