Some of the biggest mistakes that people often make while writing their cover letter are:Casualness might cost you your potential job, hence do not even dream of slacking off while composing your cover letter. Search well and put the effort in finding out the name of who you are being recruited by, in that way you can avoid the mistake of addressing them with embarrassing greetings like ‘to whom it may concern’, or ‘respected hiring manager’.Failing to present a proactive cover letter often leads to the mistake of leaving the applicant’s ball in the employer’s court. The letters with an interview request or a follow-up call request end up being more effective. Another common mistake is of failing to imply the notion of how the applicant can be of help to the company and instead of ending up narrating what they expect from the company.