Every advertised job has an application process, show them that what you have to offer matches what they need. The application process will include some of the below.
A cover letter introduces you and highlights what you have to offer the employer while a resume or CV is a document summarising your professional experience, key skills, education and qualifications.
Specific and important areas of interest to an employer, each needing a considered response in your job application.
LinkedIn is an online platform where you can create an online resume, browse and apply for jobs, and research career profiles and study pathways.
Check out the specialised workshops run by Careers & Employability.