1. A cover letter is important because it introduces you to a potential employer, explains why you're interested in the job, and highlights how your skills make you a good fit.
2. The biggest mistake to avoid is sending a generic cover letter. Tailoring your letter to the specific job and company shows that you're genuinely interested and qualified.
3. Writing a cover letter isn't always easy because it requires you to articulate your qualifications and enthusiasm clearly and concisely, while also customizing it for each application. It takes effort to make a strong, personalized case for why you're the right candidate.