This guide covers employment-based immigration end to end, for workers and for the employers that sponsor them. It sets out the nonimmigrant categories that permit temporary work, their durations, and the dual-intent distinction that determines whether permanent residence can be pursued from within them. It walks through labor certification in operational detail, including the prevailing wage determination, the required recruitment, applicant review, and the audit. It explains immigrant petitions, priority dates, the per-country ceiling, and the practical consequences of the queue. It covers adjustment of status, consular processing, admissibility, and portability. Employer compliance occupies its own part: verification, document abuse, audits, and worksite enforcement. Status maintenance, layoffs, travel, and the interaction with criminal and family law close it out.