Do both the application letter and the cover letter need to state the ways and information to obtain the recruitment information at the beginning?

Both the application letter and the self-recommendation letter need to state the ways and information to obtain the recruitment information at the beginning. According to relevant inquiries, the application letter and self-recommendation letter should state straight to the point at the beginning that you are interested in the company and will fill its vacant position, and how to learn about the recruitment information for this position. Application letters and self-recommendation letters are letters written by job seekers to employers. The purpose is to let the other party understand themselves, believe in themselves, and hire themselves. They are private and public letters. There are certain requirements for the format of the cover letter, and the content should be concise and clear. It should not be vague, general, or comprehensive.