SQL> create user newuser identified by newuser default tablespace users temporary tablespace temp;

User created.

SQL> grant connect to newuser;
SQL> 
Grant succeeded.

SQL> create table t(x int);
create table t(x int)
*
ERROR at line 1:
ORA-01950: no privileges on tablespace 'USERS'

SQL> connect /
Connected.
SQL> alter user newuser quota unlimited on users;

User altered.

SQL> connect newuser/newuser
Connected.
SQL> create table t(x int);

Table created.

SQL> create table t1(x int) tablespace tools;
create table t1(x int) tablespace tools
*
ERROR at line 1:
ORA-01950: no privileges on tablespace 'TOOLS'