Once SQL*Plus is started, you will get a SQL prompt like this: SQL>. This where you can enter commands for SQL*Plus to run.

To get help information at the SQL prompt, you can use the HELP command as shown in the following tutorial example:

SQL> HELP INDEX

Enter Help [topic] for help.

 @   COPY  PAUSE  SHUTDOWN

 @@  DEFINE  PRINT  SPOOL

 /   DEL  PROMPT SQLPLUS

 ACCEPT  DESCRIBE  QUIT  START

 APPEND  DISCONNECT RECOVER  STARTUP

 ARCHIVE LOG EDIT  REMARK STORE

 ATTRIBUTE  EXECUTE REPFOOTER TIMING

 BREAK  EXIT  REPHEADER TTITLE

...

 COMPUTE  LIST  SET  XQUERY

 CONNECT  PASSWORD  SHOW

SQL> HELP CONNECT

CONNECT

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