This document provides a guide for helping students make informed choices about which colleges to attend. It focuses on strategies for identifying and enrolling students in "match colleges" - colleges that are a good fit based on students' academic qualifications, financial needs, and personal preferences. The guide is informed by lessons learned from MDRC's College Match Program, which placed advisers in high schools to help low-income and first-generation students navigate the college application and selection process. The guide outlines best practices for creating a college-going culture, identifying match colleges, applying to colleges, assessing costs, selecting a college, and enrolling - with the goal of reducing undermatching and helping more students enroll in and complete degrees at colleges appropriate to their abilities