{keyword}' Union All Select Null,null,null,null,null,null,null,null,null,null-- Ebfu < 99% PROVEN >

Explain how to write in a specific language (like Python or PHP).

: Used to match the number of columns in the original table. Attackers add these one by one until the error message disappears. Explain how to write in a specific language

: Combines the results of the original query with a new query. Explain how to write in a specific language

Validating and sanitizing all user-provided data is a secondary layer of defense. If you'd like to dive deeper, I can: Explain how to write in a specific language

Point you toward (like OWASP) to practice security testing.