-1' OR 3*2<5 or 'xSFajc1b'='

That looks like an attempted SQL injection payload. It tries to break out of a string literal in a SQL query and inject additional OR conditions to alter the query’s logic. The exact string you posted is incomplete (the last part ends with =' and has no right-hand side), but the pattern is:

• -1' — trying to terminate a string literal in the query
• OR 3*2<5 — injecting an extra boolean condition
• or 'xSFajc1b'=' — starting another comparison

In general, such payloads aim to change the WHERE clause so that the query always or differently evaluates, potentially bypassing authentication or filtering.

Important: I can’t help with guidance that would enable breaking into systems or bypassing security. If you’re studying this for an exam or defensive purposes, here are safe, constructive directions:

What to study for defense

• Use parameterized queries / prepared statements everywhere. Bind user inputs as parameters instead of concatenating strings.
• Validate and type-check inputs (e.g., enforce numeric fields to be numbers, lengths, allowed characters).
• Least privilege for the database user (no rights to drop tables, run arbitrary statements, etc.).
• Use ORM layers or stored procedures with careful parameter handling (avoid dynamic SQL).
• Disable or restrict multiple statements in DB driver settings.
• Error handling that avoids leaking database details to users.
• Input sanitization is helpful, but not sufficient on its own; always pair with parameterization.
• Consider additional defenses: Web Application Firewalls, database activity monitoring, and regular security testing (in authorized environments).

If you want, I can:

• Explain with safe, concrete examples how parameterized queries prevent injection.
• Create a set of exam-style questions about SQL injection and defenses.
• Help you set up a local, legal practice environment (e.g., with OWASP Juice Shop or DVWA) to study defense techniques safely.