The source provides an extensive guide for individuals considering a move to Spain, detailing seven major, preventable mistakes that commonly frustrate new expatriates. These mistakes span critical areas such as legal residency requirements, emphasizing that the 90-day tourist limit must not be exceeded and outlining various visa options like the Non-Lucrative or Digital Nomad Visas. The advice also covers practical matters such as securing appropriate long-term rental contracts that satisfy residency criteria, understanding the complexities of Spanish healthcare access, and accurately estimating the true cost of living across different Spanish cities. Furthermore, the episode stresses the importance of learning the Spanish language to navigate bureaucracy, choosing the right fee-free bank accounts, and correctly handling Spanish tax residency and worldwide income reporting.