How to connect to a specified database using the tnsnames. ora file of the oracle database

How to connect to the specified database using the tnsnames. ora file of the oracle database for the given server name, user name and password, for example: server name 192.168.0.20, user name and password
All are w_basketboy. The method to connect to the database is: Enable tnsnames. add the Code 20 = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = 192.168.0.20) (PORT = 1521) in the ora file ))) (CONNECT_DATA = (SERVICE_NAME = orcl) where 20 is the name of the database, and 192.168.0.20 is the name of the server. Generally, the port is 1521 and will not change.