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Not really a question specific to the SQL Developer tool. Better to search one of the other forums. For example, try reading through this...
ERROR: ORA-12560: TNS:protocol adapter error
SQL Developer Team
In a tutorial ask me to open sql plus to unlock hr account but I can't sign in into with any account, I also try with SYS, SYSDBA, SYSTEM and my personal account
to log in, but it still send me an error panning me "ORA-12560: TNS: protocol adapter error"......
Welcome to the forums but this forum is ONLY for sql developer questions.
Please mark this thread ANSWERED and open a new thread in the Database General forum
General Database Discussions
When you post there provide your 4 digit Oracle version and information about how you are trying to connect.
Your error indicates that your client is not configured properly to connect to the database.