Start with structure, then replace every placeholder with information that is true, relevant, and natural for your context. These templates are intentionally skeletal so your final writing does not sound mass-produced.
A strong informal letter has a clear reason for writing, enough personal detail to feel genuine, a conversational but readable flow, and an opening and close that fit the relationship. In school or exam settings, the required layout should be followed without making the body stiff or formulaic.
Personal update letter [Sender details if required] [Date] Dear [Name], [Warm opening connected to the relationship]. I wanted to tell you about [main news]. [Specific detail 1]. [Why it mattered / how you felt]. [Specific detail 2 or question for the recipient]. [Forward-looking close / invitation to reply]. [Warm sign-off], [Name]
Invitation letter Dear [Name], I am writing because [occasion]. It will be on [date/time] at [place]. [Useful practical detail]. I would especially like you to come because [personal reason]. Please let me know [reply detail]. [Warm close], [Name]
Thank-you letter Dear [Name], Thank you for [specific help/gift]. [Concrete effect or moment]. I also wanted to tell you [short personal update connected to the relationship]. [Closing thought / next contact]. [Sign-off], [Name]
Advice / support letter Dear [Name], I was thinking about what you told me about [situation]. [Empathetic acknowledgment]. One option is [suggestion + reason]. Another is [suggestion + tradeoff]. Whatever you decide, [supportive but non-controlling close]. [Sign-off], [Name]
Persistent editorial registry audit: Topic slug → [ ]; claim UID/key → [ ]; source UID/key → [ ]; dependency UID + strength → [ ]; source status/version → [ ]; open review UID/reason/priority → [ ]; replacement source if any → [ ]; reviewer + resolution → [ ].