When writing the body paragraphs of a personal letter, we should indent each paragraph.
Explanation:
A personal letter, also known as a friendly letter, is a type of letter sent from one person to another regarding personal matters. Parts a personal letter should include are:
The heading - the address, line by line, with the last line being the date;
The greeting - formal or informal depending on whom we're writing the letter to;
The body, also known as the main text - the message we want to convey;
The complimentary close;
The signature line.
The beginning of each paragraph of the body should be indented. In instances when indention isn't used, some space between paragraphs should be left.