Why might an S3 website show a 403 Forbidden error?

An S3 website returns a 403 Forbidden error when the caller does not have permission to access the requested file, or when S3 cannot find the file and refuses to reveal whether it exists.
Here are the most common reasons,
1. Block Public Access (BPA) is Turned On
2. Missing Bucket Policy
3. Wrong URL Type (The "S3 API" vs. "S3 Website" Trap)
4. Missing Index Document or Typing the Wrong Path
5. KMS Encryption Conflict
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