Testlab
Notes
Code
An investigation with Splunk
TryHackMe rooms
CyberDefenders challenges
Boss of the SOC v2
Resources
Some informative blogs that range from general threat intelligence to incident response to geopolitical attacks:
DarkReading
SANS Internet Storm Center
The Red Canary Blog
Krebs On Security
Cisco Talos Intelligence Blog
CrowsStrike Blog
CTOvision
DomainTools
Microsoft security intelligence
The DFIR Report
FireEye Threat Research Blogs
The Cybersecurity and Infrastructure Security Agency (CISA)