Access control is a critical aspect of modern IT teams, and this guide provides essential information on the concepts, technologies, and best practices for implementing effective access control strategies. The guide covers various aspects of access control, including mandatory access control (MAC), discretionary access control (DAC), role-based access control (RBAC), privileged access management (PAM), virtual private networking (VPN), remote desktop protocol (RDP), software-defined perimeter (SDP), and zero-trust network access (ZTNA). It also discusses the importance of authentication, authorization, administration, audit, and accountability within an access control system. The guide highlights the advantages and disadvantages of each approach, as well as their use cases and limitations. Additionally, it provides information on how to implement ACLs, allowlisting, and other security measures to protect against cyber threats. Overall, this guide is a comprehensive resource for IT teams looking to develop effective access control strategies in today's complex network environment.