Testimonials from credible people—whether they're mentors, peers, employers, or teachers—are one of the best ways to show proof of past performance and character.  And past performance combined with character (cultural fit) are two huge elements employers

look for in potential employees. The good news is that LinkedIn has made gathering these testimonials easier than ever.  So, if you don't have any yet, think of a few people that could provide great testimonials for you, and ask for them. They'll 

make a huge difference in your next job application.

When you're first starting out and you don't have proof of generating results or credible testimonials, then the best way to get your foot in the door (if you're unable to successfully network your way into the company) is by working for free for a week, or even up to three months.

In fact, I got my dream job—the position I had my heart set on—by offering to work for free for three months. Now, of course you don't want to do this for ANY employer. Only offer this if you're fairly certain that working for free will lead to a job, and that job will open up a world of opportunities within 2-3 years for you.

What's the easiest way to practically guarantee you get the job you're applying for? Simply prove, based on past results, that you're going to bring in more revenue to the business than you cost them. For example, one campaign I thought of and helped run at my past

employer paid for my annual salary within a couple of weeks. That's solid, tangible, and quantifiable proof that I'm worth more than I cost.