The goal of the resume/application is to get an interview. Most recruiters scan a resume within 6-7 seconds. This means that your resume should be concise and easy to scan for humans AND ATS (software). It's important to read the job poster carefully for instructions as it's very easy to get screened out if something required is missing. For example, in some corporate/government postings, there are very specific instructions and documents you may need. Additionally, resumes should be single columned. The fancy "Designer" resumes or resumes with multiple columns are difficult for ATS to parse. It also helps to match the keywords if you have the time to go through it. This way, you get a better match and a stronger bias for the recruiters as you would be the most similar to the poster.

If you have any referrals or know anyone who works at that company, this could potentially be an easy way to get to the interview stage.

For being interviewed, it depends on where you're at. You can look at glassdoor (website) to prepare and research interview questions for some companies. It also gives you an idea of the salary range. Another website is payscale. I find it very helpful if a candidate comes prepared with real samples or a portfolio of their work. This is relevant for non-art professions too. If you are a business professional, perhaps you have made reports, marketing materials, etc. Pictures speak louder than words.