Important things for a Recommendation Letter –
Salutation – If a letter is personal, it is required to include a salutation – Dear Mr./Ms/Mrs.)
If letter is not addressed to a particular person, it is fine to write – “To Whom it May Concern” or you can leave it blank.
Paragraph 1 – The first paragraph states the writer’s connection with the concerned person for a recommendation letter. State your relation with the person and how you know them well in what capacity.
Paragraph 2 – The second paragraph has the specific information related to the concerned person. It should state why the person is qualified for recommendation, their attributes and why you trust them and writing the letter
Paragraph 3 – If the letter is for specific purpose, for instance, a job opening, then it is good to write about the person’s skills & qualities that suit the job position.
Summary – This section is for brief conclusion of why are you are recommending the person.
Closing – End the letter with ‘Sincerely,’ followed by your name and designation.