When applying for Research Experiences for Undergraduates (REUs), it's advisable to submit applications to around 5 to 10 programs to ensure quality over quantity. Most REUs typically request unofficial transcripts, which are free, while only a few require official ones. Admission is competitive, with many applicants vying for limited spots, so applying to lesser-known programs may increase chances of acceptance. Concerns about race and gender in the application process are noted, with some programs encouraging applications from underrepresented minorities. However, this does not significantly disadvantage other applicants, and strong grades, letters of recommendation, and a compelling essay are crucial for success. The REU system aims to provide research opportunities, particularly for students from smaller institutions, while also promoting diversity in STEM fields. Overall, focusing on the application quality and relevant experiences is essential for a successful application.