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Principle
The word principle means a standard, a law or a rule. This means you can have:

• the principles of economics, which are the laws that govern economic theory
• moral principles, which are the rules and standards that govern your behavior

Principal
The word principal usually refers to a person. Remember that it ends in ‘pal’, which is a person. A principal can be:

• the head of a school
• the head of an organization
• the main person involved in a contract or financial negotiation

Putting It All Together
If you remember that principal is a person, then you can easily make sense of this sentence:

The principal taught us the first principle of social responsibility.