If you want to be a good person, you need to understand all the tactics of bad people and despicable individuals.

If you want to guard against gold diggers and protect yourself from scoundrels, you need to understand their schemes and tricks to prevent yourself from being deceived, harmed, or exploited.
Know your enemy and know yourself; then you will never lose a battle.
Know those tactics, but don't use them.
Be resolute in never doing wrong; only use legitimate and lawful methods.
It's best to find ways to distance yourself from those misguided people early on and avoid entanglement with them, because they will constantly set traps with no ethical boundaries.
Yet people of integrity and virtue have many reservations.