The blog post by Daniel Berman discusses how to analyze and visualize OSSEC alerts within the ELK Stack, specifically using Kibana. It explains how to map and display JSON-formatted OSSEC alerts in Kibana's Discover page by adding key fields like "rule.xxx" and hostname to gain insights into the data. Users can perform both free-text and field-level searches to identify specific alerts, and Kibana supports a variety of query types. The post further details creating visualizations, such as pie charts for the top OSSEC agents, line charts for alert trends over time, and geographical maps to depict the origins of intrusion attempts. It emphasizes the capability to compile these visualizations into a comprehensive OSSEC dashboard using ELK Apps, which includes a pre-made dashboard for OSSEC alerts. The article also highlights Wazuh's web app for managing and monitoring their infrastructure and previews the next series installment, focusing on Logz.io's alerting mechanism for OSSEC events.