The application process to graduate school can often be confusing for students. Here are some links to help you navigate that murky territory, for both psychology majors and non-psychology majors.

General Resources

Facing grad school rejection letters- In this series by The Novice Professor blog, we talk about the importance of research and persistence during the application process.  
The Professor is In- Dr. Karen Kelsky has amazing resources for graduate and undergraduate students (in a variety of programs, not just psych).
How to Handle Graduate School Denials- Dr. Don Martin at U.S. News speaks to a wider audience beyond just psychology students about handling rejections.  
Getting involved in undergraduate research- John Norcross wrote a list of recommendations for getting started in research.
Undergraduate Research Opportunities & Internships- The APA compiled a list of research an internships and opportunities for a variety of fields.

Resources for Psych Majors

Applying to Graduate Schools- This APA resource page has lots of information about applying to psychology graduate programs, such as links to helpful videos, advice for preparing your personal statements, and key questions to consider before you apply, just to name a few. 
It's never too early to begin- Another resource from APA written by Dr. Karen Appleby and Dr. Drew Appleby contains a wealth of information about the application process.
7 Tips for Applying to a Psychology PhD Program- Dr. Todd Kashdan gives some great advice and reflects on how the application process as evolved and become more competitive. 
Pre-professional psychology opportunities- Dr. Steven Buzinski discusses internships for psychology students at any level.