A cover letter, covering letter, motivation letter, motivational letter or a letter of motivation is a letter of introduction attached to, or accompanying another document such as a r_sum_ or curriculum vitae.

A business proposal is a written offer from a seller to a prospective buyer. Business proposals are often a key step in the complex sales process i.e., whenever a buyer considers more than price in a purchase. wikipedia.org

A blog is a personal journal published on the World Wide Web consisting of discrete entries ("posts") typically displayed in reverse chronological order so the most recent post appears first. wikipedia.org

Professional writing involves the use of clear language to convey information in a way that is easily understood by the intended audience. Individuals who can use language well may be employed as full-time professional writers in a variety of communications-related occupations, such as wikipedia.org

QuickBooks is a line of business accounting software developed and marketed by Intuit. wikipedia.org

Office administration is a set of day-to-day activities related to financial planning, billing and recordkeeping, personnel, and physical distribution and logistics, within an organization. wikipedia.org

A biography is a detailed description or account of someone's life. It entails more than basic facts (education, work, relationships, and death), biography also portrays the subject's experience of those events.