In an era where cyber threats are continuously evolving in number and complexity, network security has become paramount. Network Intrusion Detection Systems (NIDS) play a crucial role in ensuring network security. These systems are designed to detect malicious network traffic, abnormal behaviours and intrusion attempts in computer systems alerting administrators when an intrusion or abnormal behaviour is detected. The study of network security involves acquiring knowledge about network traffic monitoring and understating the most common network attacks, such as Denial of Service (DoS), Distributed Denial of Service (DDoS), reconnaissance and information theft. Additionally, it is crucial to understand intrusion detection techniques, including signature-based and anomaly-based methods.